Septic in Larimer County, CO

Last updated: Mar 21, 2026

Larimer County sits at the edge of the plains and the foothills, where many homes rely on private septic systems rather than municipal sewer. In town limits like Fort Collins, Loveland, Windsor, and Estes Park you'll find extensive sewer networks, but many neighborhoods and rural properties still depend on septic. If you're buying or owning a home here, you should expect to encounter a septic system in appropriate locations and be prepared to understand how it works and how to care for it.

Is septic common in Larimer County? Yes, especially in rural, hillside, and widely spaced parcels. While newer subdivisions closer to established towns may be connected to city sewer, a large share of Larimer's homes operate on on-site systems. If your property isn't within a municipal sewer district, septic is the standard setup. A quick check with the county or your seller can confirm whether your home is on a septic system or connected to town sewer.

Why homes typically use septic systems in Larimer County. The answer comes down to practicality and geology. Farms, ranches, and many suburban plots cover more land per home than urban cores, making extended sewer lines costly and logistically challenging. The Front Range's mix of rocky soils, clay, and varying groundwater depths means a well-designed on-site system often fits the site better than a centralized treatment plant nearby. Properly planned septic systems let water, solids, and microbes separate safely on your property when soils are suitable and maintenance is consistent. In short: septic exists here because it's a reliable, cost-effective solution for dispersed development on challenging terrain.

County growth history and how that has impacted septic coverage. Larimer County has evolved from rural farms and open range into a growing mix of towns, suburbs, and countryside. As communities expanded outward, municipal sewer lines extended into more areas, but lots remain outside those networks, keeping septic as the standard option for many homes. Growth has also increased the demand for well-maintained systems and informed homeowners, with more property transactions requiring septic inspections and more emphasis on proper design, installation, and ongoing care to protect groundwater and local wells.

High-level explanation (why septic exists here). On-site systems were and remain a practical, locally appropriate method to treat household wastewater where centralized infrastructure isn't feasible or cost-effective, especially on hillside, rural, or newly developed parcels with soils suited to septic design.

Here you'll find practical guidance to help you understand, inspect, and care for septic systems in our county, backed by experience you can trust.

How Septic Is Regulated in Larimer County

How regulation works in Larimer County

Colorado sets statewide standards for on-site wastewater systems through the Colorado Department of Public Health and Environment (CDPHE). Counties and municipalities then implement and enforce those rules locally. In Larimer County, the county Department of Health and Environment handles permitting and inspections for OWTS in unincorporated areas, while cities and towns within the county manage their own programs. If you live inside a city or town, check with the local environmental health or building department for specifics, as rules can vary.

Who handles permits and inspections

  • Unincorporated areas: Larimer County Health and Environment administers permits, plan review, site evaluations, and inspections.
  • Incorporated areas: Contact your city or town's environmental health or building department for the permit and inspection process.
  • State role: CDPHE provides statewide standards, licensing for installers, and oversight of the on-site wastewater program.
  • Professionals: Work must be performed by CDPHE-licensed on-site wastewater system installers and designers; this protects water quality and ensures proper system design and installation.

Permitting process in steps

  1. Determine jurisdiction (unincorporated vs within a town or city).
  2. Confirm licensing requirements and hire a CDPHE-registered installer or engineer for design and installation.
  3. Prepare a complete permit package, including a site evaluation and OWTS design plan compliant with state and county requirements.
  4. Submit the permit package to the appropriate agency (Larimer County for unincorporated areas; the relevant city or town for incorporated areas).
  5. Pay applicable fees, undergo plan review, and obtain permit approval before work begins.
  6. Schedule and pass required inspections during installation (and a final inspection after completion) before the system is put into service.

Inspections and ongoing maintenance

  • Inspections: Expect a sequence of inspections during installation, including soil evaluation validation, plumbing connections, and a final startup check.
  • Maintenance: Document routine maintenance and pumping. Most systems benefit from periodic pumping every few years, with exact timing depending on tank size, household size, wastewater volume, and sludge buildup.
  • Conditions: Any modification, repair, or replacement generally requires a new plan review and permit, plus inspections to verify compliance with current standards.

What to know when selling or transferring ownership

  • Disclosure: OWTS status, age, and maintenance history are typically disclosed in real estate transactions, as required by local and state regulations.
  • Records: Keep permits, inspection reports, and maintenance logs readily available for buyers and for future trade-in or resale.

Keys to staying in compliance

  • Use licensed professionals for design, installation, and pumping.
  • Keep all permits and inspection approvals on file.
  • Follow recommended maintenance schedules and keep service receipts.
  • If you plan to remodel or relocate a system, verify with the appropriate authority before proceeding.

Resources

  • Colorado Department of Public Health and Environment – On-site Wastewater Program:
  • Larimer County Health Department (environmental health and OWTS guidance): https://www.larimer.gov/health

Soil, Groundwater & Environmental Factors in Larimer County

Soil characteristics in Larimer County

Larimer County soils are diverse, ranging from shallow, rocky foothill soils to deeper, loamy soils in the plains. The infiltration rate and depth to bedrock or hardpan can vary dramatically from property to property, which directly affects septic performance.

  • Soil texture and structure influence absorption: well-drained sandy loams typically accept effluent more readily than heavy clays.
  • Rock outcrops and cobbles are common on foothill parcels and can limit excavation depth and trench size.
  • Permeability variations mean some sites require alternative designs (for example, mound systems or sand-filtration beds) when standard trenches won't meet performance needs.
  • Depth to bedrock or hardpan affects system depth, excavation limits, and feasibility.

Groundwater depth and water table dynamics

Groundwater depth and seasonal water table are critical to septic design. In Larimer County, higher groundwater or perched water near the surface is more common in floodplains and lower-lying areas.

  • Expect seasonal fluctuation with spring snowmelt and summer rain.
  • Shallow groundwater or perched water can reduce the vertical separation distance a system needs.
  • Always verify setbacks from wells and surface water sources; local regulations specify minimum distances to protect drinking water and streams.

Environmental factors and climate considerations

Local climate and landscape also shape septic system choices.

  • Freeze-thaw cycles can affect soil structure and infiltration capacity.
  • Slopes and runoff increase erosion risk and may require engineered features to protect system components.
  • Floodplains and wetlands: soils in these zones are not suitable for conventional designs and may require a different approach or avoidance.
  • Vegetation and root zones: extensive roots can interfere with pipes and leach fields.

Site evaluation steps for homeowners

Use a structured approach to determine suitability and next steps.

  1. Review soil and site data: use Web Soil Survey to understand soil series, texture, and drainage on your parcel. https://websoilsurvey.nrcs.usda.gov/
  2. Observe the land: map drainage patterns, swales, mounds, and areas where water pools after rain.
  3. Check groundwater proximity: if you're near a known water well or seasonal wetlands, plan for greater setbacks.
  4. Assess depths: identify any bedrock near the surface or very shallow soils that limit excavation.
  5. Consult local guidance: Larimer County and state regulations govern setback distances and permit requirements. Visit the county's health and environment pages for current rules: https://www.larimer.org/health
  6. Hire a licensed professional: a septic designer or engineer should perform percolation tests, soil logs, and system design, then help you secure permits.

Practical tips and official resources

  • Protect soil during construction: minimize compaction and preserve topsoil.
  • Plan for future water management: ensure downslope drainage won't overload the leach field.
  • Get professional soil logs and percolation tests to confirm site viability.

Official resources:

Typical Septic System Types in Larimer County

Conventional septic systems

A conventional gravity system is the most common choice in Larimer County when the soil is suitable. It relies on a simple flow: house wastewater goes into a septic tank, where solids settle and scum forms; the liquid effluent then drains to a soil absorption field (drainfield) for treatment by the native soil.

  • How it works: wastewater travels from the house to a septic tank, then to a drainfield via gravity or a simple distribution box. Solids stay in the tank; clarified effluent percolates into the soil where microbes help treat it.
  • Typical components: septic tank, distribution box, and drainfield made of trenches with gravel or prefabricated chambers.
  • Site fit: works best with well-drained soils and adequate separation from groundwater and bedrock.
  • Maintenance: regular pumping (interval depends on tank size and usage) and avoiding driving or planting over the drainfield.
  • Official guidance: for design and permitting details, see CDPHE's onsite wastewater guidance and Larimer County environmental health pages:

Mound systems

Mound systems are engineered to overcome challenging soils, especially shallow depths, high water tables, or heavy clay. They elevate the drainfield above problematic native soils using a designed fill and layers of sand.

  • When used: in sites with limited suitable soil depth or percolation, or where traditional drainfields won't function.
  • How they're built: septic tank + dosing chamber or distribution box, then an elevated "mound" of sand-gravel mix with several inches of topsoil for the absorption area.
  • Pros: allows effluent treatment where native soils are unsuitable.
  • Cons: higher upfront cost and ongoing maintenance; requires more space and access for inspection.
  • Official guidance: Larimer County and CDPHE provide specifics on mound design and permitting.

Alternative treatment systems

In areas with tough soils, limited space, or site constraints, alternatives treat wastewater before the drainfield or bypass soil limitations.

  • Aerobic Treatment Units (ATU): a fan- or diffuser-aerated tank breaks down organics more aggressively; effluent is treated further before discharge to a drainfield or spray irrigation.
    • Pros: smaller drainfield footprint; better performance in challenging soils.
    • Cons: higher energy use; needs regular maintenance and inspections.
  • Sand filter and media filtration systems: effluent is pumped through a bed of sand or other media for additional polishing before release to the drainfield or irrigation.
    • Pros: reliable treatment in marginal soils.
    • Cons: periodic media maintenance and replacement.
  • Evapotranspiration (ET) beds: engineered beds designed to evaporate and transpire water; best in arid climates with adequate sun exposure.
    • Pros: reduced drainfield footprint in suitable climates.
    • Cons: climate-dependent and site-specific.
  • Constructed wetlands and reed beds: shallow planted beds that use vegetation and microbes to treat effluent.
    • Pros: aesthetically pleasing; good long-term performance in some soils.
    • Cons: larger footprint; vegetation management required.
  • Drip/low-pressure distribution: distributes effluent slowly to multiple small emitters, sometimes used with ET beds or porous treatments.
    • Pros: flexible layouts; efficient use of soil.
    • Cons: requires careful design and monitoring to prevent clogging.
  • Official guidance: these advanced systems are governed by state and county regulations and require approved designs and installers.

Choosing and sizing your system (quick steps)

  1. Get a site and soil evaluation by a licensed designer or engineer. 2) Check regulatory pre-approval with LCDHE and CDPHE. 3) Review system options based on soil, space, and climate. 4) Have a licensed installer design and install the selected system. 5) Schedule regular inspections and follow maintenance guidelines.
  2. Maintenance reminders: pump on a recommended interval, protect the drainfield from heavy loads, conserve water, and avoid flushing non-biodegradable items.

Official resources to verify requirements and find licensed professionals:

Typical Septic Issues Across Larimer County

Common symptoms you might notice

  • Slow drainage in sinks, tubs, or showers.
  • Gurgling sounds in pipes after flushing or draining.
  • Sewage odors around the house, yard, or near the septic system.
  • Soggy, unusually lush patches or wet spots in the drainfield area.
  • Backups into toilets or drains after heavy rainfall or high water use.

Drainfield and soil signs

  • The drainfield area feels saturated or squishy and doesn't dry out between rains.
  • A strong brown, muddy, or foul-smelling area above the drainfield.
  • Cracks in pavement or foundation near the septic system, or damaged drainfield covers.
  • Lush vegetation or tall grasses that look unusually green over the drainfield.

Water use and household habits that affect OWTS

  • Frequent, large-volume discharges from washing machines, dishwashers, or multiple showers.
  • Regular disposal of grease, oils, or chemical cleaners down drains.
  • Overuse of toilets (high-volume flushes) or ignoring recommended pumping schedules.
  • Use of in-tank or in-line additives that claim to "fix" septic tanks.

Landscaping, roots, and system location

  • Tree or shrub roots growing toward or into the septic tank, pipes, or drainfield.
  • Construction or heavy equipment near the system that can compact soil or damage components.
  • Seasonal changes in soil moisture that repeatedly cover the system during spring snowmelt or heavy rains.

Seasonal and climate considerations in Larimer County

  • Freeze-thaw cycles can hinder drainage and push surface water into the drainfield during winter and early spring.
  • Spring runoff and rapid snowmelt may saturate soils, delaying proper effluent absorption.
  • Irrigation upcycling in summer can overwhelm the system if outdoor water use isn't managed.

Component health and maintenance considerations

  • Cracked or leaking septic tank lids, or damaged baffles and filters inside the tank.
  • Pump failures in pumped or alternative systems (where applicable) leading to poor distribution.
  • Filters or screens that are overdue for cleaning or replacement, causing backups.

Maintenance mistakes to avoid

  • Flushing wipes, feminine hygiene products, diapers, or cotton swabs down the toilet.
  • Dumping solvents, paints, pesticides, or household chemicals into the system.
  • Ignoring pumping schedules or extending intervals well beyond manufacturer/local guidance.
  • Driving heavy equipment over the drainfield or parking on it.

What to do if you notice issues (step-by-step)

  1. Reduce water use and avoid heavy discharges until a pro inspects.
  2. Do not attempt to "fix" or pump out the system yourself without guidance.
  3. Schedule a visit with a licensed septic professional to diagnose tank, baffles, pump, and drainfield health.
  4. Contact your local health department or county environmental health office if you suspect a failure or public-health risk; they can provide guidance on permits, pumping, and replacement options.

Official resources

  • Colorado Department of Public Health & Environment – Onsite Wastewater Treatment Systems (OWTS):
  • U.S. Environmental Protection Agency – Septic Systems: (local guidance and utility of county programs)

Septic Inspection, Permits & Local Oversight

Who regulates septic in Larimer County

  • Larimer County Health & Environment oversees onsite wastewater treatment systems (OWTS) in unincorporated areas and many towns.
  • The Colorado Department of Public Health & Environment (CDPHE) sets state standards for design, installation, and maintenance of OWTS.
  • What this means for you: permits are required for installations and major repairs, and inspections are part of ensuring systems protect soil, groundwater, and public health.

Permits you might need

  • New OWTS installation in a permitted area.
  • Replacement, upgrade, or expansion of an existing system.
  • Major repairs, changes in wastewater flow, or changes in property use (for example, adding a living unit).
  • Real estate transfers when an OWTS inspection is requested or required by the county or seller/buyer agreement.
  • Note: Some towns have their own permitting programs. Always confirm whether Larimer County or your city handles the permit.

Step-by-step: Getting a permit

  1. Confirm jurisdiction for your property (unincorporated Larimer County vs. a city with its own program).
  2. Gather required documents (site plan, lot size, drainage patterns, any existing tank or field information).
  3. Submit a completed permit application to the Larimer County Health & Environment or the applicable city department.
  4. Include design details or comply with CDPHE OWTS design standards if a new/system upgrade is planned.
  5. Pay permit fees and respond to plan-review requests from the agency.
  6. Schedule required inspections at key milestones (see "Inspections During Installation" below).

Inspections during installation

  • Pre-installation or soil evaluation inspection to verify suitability for the planned OWTS.
  • During construction: inspections after trenching and piping are installed, and after septic tank placement is complete.
  • Backfill and cover inspection to confirm proper backfill, compaction, and surface grading.
  • Final inspection to verify system operation, proper venting, and all components meet code.
  • Inspections are typically requested by your licensed installer or contractor; keep your permit number handy and coordinate access with the inspector.

Real estate transactions and inspections

  • Real estate transactions may trigger an OWTS inspection as part of due diligence.
  • Steps:
    1. Discuss with your real estate agent whether an OWTS inspection is recommended or required for the sale.
    2. Schedule the inspection with the Larimer County Health & Environment or the local city department, if applicable.
    3. Obtain the inspection report and address any deficiencies before closing or as negotiated.
  • If the system needs work, you may need a repair permit or compliance confirmation before the transfer can finalize.

Local oversight, enforcement & maintenance

  • Local agencies can require corrective actions if a system is not compliant or poses a risk to groundwater or surface water.
  • Proactively maintain your OWTS: keep records of permits, inspections, and maintenance, and use a licensed installer for any work.
  • Regular operation and maintenance (O&M) inspections may be required for some systems, especially in sensitive areas or where ongoing management is part of local rules.

Helpful resources

  • Larimer County Health & Environment – Septic Systems: overview, permit guidance, and inspection scheduling:
  • General Larimer County regulations and contact information for inquiries about OWTS permits or inspections: https://www.larimer.gov/health/owts (searchable through the Health & Environment department pages)

Cost Expectations for Septic Services in Larimer County

Septic Tank Pumping and Cleaning

  • What it includes: removing sludge and scum from the tank, inspecting baffles and inlet/outlet pipes, testing sludge layer depth, and verifying proper disposal. Professional technicians check for roots, leaks, and tank condition; they may also note if a riser or lid upgrade is warranted.
  • Larimer County specifics: many homes rely on soils and groundwater conditions that affect pumping frequency and access. Winter access can be harder in mountainous areas, which can influence labor time and travel.
  • Typical cost in Larimer County: $350–$800 per pumping, depending on tank size, accessibility, and any needed follow-up work.

Septic System Inspection (including real estate pre-purchase evaluations)

  • What it includes: visual inspection of all accessible components (tank, pump chambers, distribution box, drain field), measurement of tank levels, baffle condition check, and functional tests. Comprehensive inspections may include camera evaluations of lines and a written report.
  • Larimer County specifics: real estate transactions often prompt a formal system evaluation to confirm operability and identify imminent repair needs.
  • Typical cost in Larimer County: basic inspection $150–$300; comprehensive inspections with line evaluation or written reports typically $400–$900.

Camera Line Inspection and Diagnostics

  • What it includes: high-definition camera inspection of sewer lines from the house to the tank and from the tank to the drain field (if accessible), locating/sequencing lines, identifying cracks, root intrusion, or collapses; may also map line locations for records.
  • Larimer County specifics: camera work is common when there are signs of intermittent backups or prior field issues, and it helps plan repairs with minimal disruption.
  • Typical cost in Larimer County: $350–$1,000.

Drain Field Repair and Replacement (Leach Field)

  • What it includes: evaluation of soil conditions, soil tests if needed, repair options (trench restoration, piping/replacement, media additions for mound systems), and sometimes alterations to distribution or dosing for ATUs.
  • Larimer County specifics: soil depth, slope, and groundwater considerations can drive more extensive work or alternative system designs (e.g., mound or ATU-based setups).
  • Typical cost in Larimer County: minor repairs $2,000–$6,000; moderate to extensive repairs $6,000–$15,000; full drain-field replacement often $15,000–$40,000+ depending on site and system type.

Aerobic Treatment Unit (ATU) Maintenance, Service, and Replacement

  • What it includes: servicing the ATU unit, cleaning clarifier, replacing filters, testing aerator and pumps, checking alarms, and dosing controls; some visits include a written service report.
  • Larimer County specifics: ATUs are common where soil conditions or space limits make conventional drains impractical; annual maintenance is typical.
  • Typical cost in Larimer County: $300–$900 per visit; annual service contracts range $500–$1,200.

Tank Riser and Lid Upgrades, Access Improvements

  • What it includes: installing or upgrading risers and secure lids for easier future access, reducing the need for digging; may include conversion to compliance-required lids.
  • Larimer County specifics: better access simplifies regular pumping and inspections, important in cold climates where frozen ground can hinder access.
  • Typical cost in Larimer County: $800–$2,000.

Septic System Filters, Baffles, and Pumping Components

  • What it includes: installation or replacement of effluent filters, checking/remediating inlet/outlet baffles, and pump replacements if applicable.
  • Larimer County specifics: filters and baffles help protect the drain field; proper maintenance is especially important where soils are marginal.
  • Typical cost in Larimer County: filter installation $100–$350 (parts); service including cleaning or replacement $200–$600.

Design, Permitting, and Project Planning for Replacements or Upgrades

  • What it includes: site evaluation, system design (conventional, ATU, or mound), soil testing, and permit applications; may include bid review and coordination with local authorities.
  • Larimer County specifics: project permitting and design must align with county environmental health requirements and state Onsite Wastewater regulations.
  • Typical cost in Larimer County: design/engineering $2,000–$6,000; permit and plan review $500–$3,000, depending on scope.

Official resources:

Notes:

  • Costs vary by lot, system type, accessibility, and permit requirements. Always get a written scope and multiple estimates for sizeable work.

Cities & Communities in Larimer County With Septic Systems

Communities where septic is common in Larimer County

  • Bellvue (unincorporated, along the foothills near the Poudre River)
  • Drake (unincorporated, southwest of Bellvue)
  • Glen Haven (unincorporated, northwest of Estes Park)
  • Livermore (unincorporated, along US-287)
  • Red Feather Lakes area (unincorporated, northwest Larimer County)
  • Poudre Canyon communities (areas along CO-14 and nearby canyons)

Note: In these areas outside city limits, many homes rely on on-site septic systems rather than centralized sewer. Availability of sewer service can vary by neighborhood, so verify your specific address with the county or a licensed professional if you're buying, selling, or building.

How septic management works in these areas

Septic systems in rural Larimer County are typically small, privately owned units serviced by the homeowner. Because there isn't always a municipal sewer, every homeowner is responsible for the proper design, installation, operation, and maintenance of their system. Proper maintenance protects your property value, prevents groundwater contamination, and safeguards nearby wells and streams.

Quick maintenance checklist for septic systems

  • Schedule regular pumping every 3–5 years (more often for high-usage households or older systems).
  • Keep a records folder: installation date, tank size, baffle status, last pumping, and any repairs.
  • Conserve water to reduce load on the system: fix leaks, install high-efficiency fixtures, and spread laundry across days.
  • Mind the drain field: avoid parking or heavy machinery over the area; bottle-supplanting trees or shrubs with shallow roots near the field.
  • Only use septic-friendly products: limit harsh cleaners, solvents, and non-biodegradable items going down the drain.
  • Schedule proactive inspections before buying/selling or when you notice signs of trouble (gurgling sounds, lush spots, odors, or wastewater backing up).
  • If you have a well on the property, ensure safe separation distances and consider annual inspections to protect groundwater quality.

Steps to confirm your septic status (ownership or purchase)

  1. Locate the septic tank and drain field on your property using the diagram from your permit records or the selector tool from the county.
  2. Check with Larimer County Health Department or the local building department for permit history and system type.
  3. Have a licensed septic service provider perform a formal inspection and pump if due.
  4. Keep a maintenance schedule and share records with future buyers or lenders.

Official resources

If you're unsure whether your particular property in a rural Larimer County corridor uses septic or a small municipal system, contact the county health department or a licensed septic professional for a site-specific assessment.

Septic vs Sewer Across Larimer County

How septic systems differ from sewer

  • Wastewater handling: Septic systems treat and discharge wastewater on-site; sewer systems transport it to a municipal plant for treatment.
  • Responsibility and cost: With a septic, you own and maintain the system (pumping, seals, leach field). With sewer service, you pay a monthly utility bill and rely on the city or district for maintenance.
  • Upfront vs ongoing costs: Septic installation is a large upfront investment; sewer connection costs are typically one-time connection fees plus ongoing monthly rates.
  • Environmental footprint: Properly designed, installed, and pumped septic systems protect water quality; sewer systems avoid on-site discharge but require reliable infrastructure and treatment capacity.

In Larimer County: who uses what?

  • Unsewered and rural areas: Most homes rely on individual septic systems. Regular pumping and inspections are essential in these zones.
  • Serviced neighborhoods and cities: Fort Collins, Loveland, Berthoud, Estes Park, and other towns generally rely on municipal sewer where available; connection is common when lines reach new developments or properties are redeveloped.
  • Availability matters: If you're unsure whether your property is on sewer, contact your local utility or Larimer County's environmental health team to confirm service status and any connection requirements.

Costs and long-term economics

  • Septic ownership:
    • Typical pumping every 3–5 years (costs vary by region and size; plan for preventive maintenance rather than emergency fixes).
    • Potential repair or replacement of components (pump, distribution box, field lines) can be substantial.
    • Long-term cost depends on usage, soil conditions, and maintenance discipline.
  • Sewer service:
    • Monthly or quarterly utility bills cover operations, maintenance, and upgrades.
    • Hidden costs can include fees for new service connections, capacity charges, or rate increases.
  • Typical decision drivers:
    • Availability of sewer, distance to the main, and soil suitability for a septic field.
    • Land value and the risk of drainage or groundwater issues.

Maintenance and common issues

  • Pump regularly: Schedule pumping every 3–5 years or as recommended by your service professional.
  • Protect the leach field: Avoid heavy vehicles or structures on the drain field; keep trees and shrubs away to prevent roots.
  • Mind the inputs: Do not flush wipes, grease, solvents, or chemicals; reduce water waste to lower loading on the system.
  • Inspect and test: Have a professional inspect the septic tank and distribution system after significant rain or nearby construction.
  • Use appropriate products: Household cleaners and septic-safe products can help keep beneficial bacteria; avoid harsh chemicals that kill them.
  • Monitor signs of trouble: Slow drains, gurgling pipes, sewage odors, damp spots, or wet areas above the drain field require prompt attention.

When to connect to sewer

  1. Check service maps for your street or parcel with your local sewer provider or Larimer County.
  2. If sewer is available, request a formal connection assessment and cost estimate from the utility.
  3. Have a licensed septic professional evaluate your current system for compatibility, potential disconnect, or transfer to sewer.
  4. Compare ongoing sewer charges with maintenance costs and expected septic life to decide on a long-term plan.

How to determine your system and find official resources

  • Step 1: Look up your property's service status with the local city or district sewer utility.
  • Step 2: Contact Larimer County Health Department for guidance on onsite wastewater and potential permitting requirements.
  • Step 3: If you're considering switching to sewer, get a written assessment from a qualified septic professional and from the sewer provider.

Official resources

  • Colorado Department of Public Health & Environment – Onsite Wastewater:
  • U.S. Environmental Protection Agency – Onsite Wastewater Systems:
  • Larimer County Health Department – Onsite Wastewater / Environmental Health: