Septic in Hastings, MI

Last updated: Apr 26, 2026

Where Septic Systems Are Common in Hastings

Map of septic coverage in Hastings, MI

Hastings Soil and Water Table Risks

Variable soils drive drastically different drain-field needs

Hastings-area lots sit on deep loam and silt loam soils, but pockets of clay and sandy outwash from glacial deposition are common. That means the ground beneath your yard changes character across short distances. Permeability can shift enough between neighboring parcels that a drain-field size, layout, or even the chosen system type must be reassessed from one lot to the next. What works on a neighboring property might underperform here, or fail outright, if a sudden clay pocket or a sand channel sits beneath the proposed leach lines. The soil tells the story before you ever install.

Groundwater swings amplify risk in design and performance

Groundwater is typically moderate to high in spring and after heavy rains, and Hastings experiences seasonal saturation that matters. When the water table rises, unsaturated soil that would normally disperse effluent becomes saturated, raising the lees of risk for effluent return and surface seepage. Systems without adequate setback or alternative distribution can experience backflow, scum buildup, and premature failure. Spring and post-storm conditions are not background noise; they are central constraints that must steer every design choice, inspection schedule, and long-term maintenance plan.

Soil pockets dictate system selection on the same block

Those abrupt soil changes affect permeability enough that drain-field sizing and even system selection can change from one property to another in the same local area. A conventional gravity field may suit a section of a yard, while a nearby pocket of clay or perched water requires a mound, chamber, or pressure distribution system to meet soil and water conditions. In Hastings, it's not the lot size alone that drives choice; it is the microscopic reality of where water and air can move through the soil profile. That means site evaluations must map both texture and perched water risk at multiple points on the property.

Seasonal saturation as a central failure concern

Seasonal saturation is a central design and failure concern for local systems. When the spring water table rises, the available unsaturated zone shrinks, and the effluent has fewer pathways to disperse. If the system is sketched to the dry season, it may haul through winter and spring poorly, even if summer diagnoses look favorable. This is not a one-off caution; it recurs annually in Hastings' climate, demanding a design that anticipates the wet months and a maintenance cadence that catches rising water tables before they undermine performance.

What you can do right now to reduce risk

Begin with a precise site evaluation that records soil texture at several depths and locations across the proposed field area, rather than relying on a single boring. Request a groundwater observation plan that tracks water table fluctuations through the spring and after storms, so the design team can forecast seasonal performance rather than guess. Favor designs that accommodate soil variability-such as modular, adaptable layouts or alternative distribution methods-when the site shows mixed textures or perched water pockets. If a test hole reveals clay pockets or rapid water rise near the surface, treat that area as a red flag and discuss mound, chamber, or pressure distribution options as likely requirements. Finally, implement a monitoring strategy after installation: regular observations of surface pooling, effluent odors, or unusual wetness, especially during spring runoff, and schedule proactive pumping and filter checks aligned to the wettest times of year. Hastings properties demand vigilance because the ground itself can flip a system's fate with the seasons.

Best System Fits for Hastings Lots

Overview of local system types

The most common local system types are conventional, gravity, pressure distribution, chamber, and mound systems. Each type responds differently to the glacially mixed soils that characterize Barry County, where drainage pathways vary from well-drained loams to pockets of silt and clay that can hold water longer into spring. Understanding which system fits your lot hinges on how quickly the soil sheds water and where the seasonal groundwater table rises.

When conventional or gravity systems are appropriate

Conventional and gravity designs tend to work best on Hastings-area lots with the better-drained loam and silt loam soils noted locally. If a site offers a continuous, permeable profile from trench to drain field and the seasonal groundwater swings stay below the critical rooting depth during installation, a conventional layout can provide reliable long-term performance with a straightforward drain pattern. Gravity systems, by relying on natural slope and gravity flow, benefit from intact, well-drained horizons where effluent can percolate without rapid saturation. On such lots, strive for a field layout that preserves ample separation from foundations, wells, and any high-water table corridor identified by site evaluation.

When alternative designs become more relevant

Mound, chamber, and pressure distribution systems become more relevant on Barry County sites with perched clay pockets, wetter conditions, or higher seasonal groundwater. If a compacted zone or a perched clay band interrupts vertical drainage, a mound or chamber layout can place the dispersal area above the highest moisture zone, using controlled fill to establish a suitable drawdown and percolation rate. Pressure distribution systems help where soils exhibit variable percolation across a lot, delivering effluent in a staged manner to multiple smaller trenches and reducing the risk of piping pressure losses when groundwater rises in spring. For lots with fluctuating wetness, a staged approach-designing for the wettest season while maintaining adequate reserve capacity-can prevent premature field failure.

Step-by-step approach to selecting a fit for your lot

  1. Map the soil: get a detailed soil survey or professional percolation tests that identify zones of good drainage versus perched clay pockets. Note where groundwater rises in spring and how deep it stays through the growing season.
  2. Assess the lot's drainage pattern: determine if gravity flow from the house to the drain field is feasible without pumping and whether a conventional field will stay consistently dry in spring and early summer.
  3. Evaluate soil depth and horizon quality: confirm the depth to prohibitive layers and the presence of any glacial features that could trap moisture or impede infiltrative capacity.
  4. Consider seasonal swings: plan for the wettest period by choosing a design that maintains separation from water-saturated zones, potentially using mound or chamber dispersal where conventional field performance would be compromised.
  5. Choose a system with modular flexibility: if initial soil tests reveal mixed conditions, you may benefit from a system that can be adjusted or expanded, such as a chamber or pressure distribution layout, to accommodate later shifts in groundwater or soil structure.

Practical takeaway for Hastings lots

On the better-drained portions, a conventional or gravity approach can deliver solid, straightforward performance. For sites with perched clay pockets or consistently wetter springs, prepare for an alternative dispersal method-mound, chamber, or pressure distribution-so the drain field maintains long-term function. The key is aligning the chosen system with where water moves and sits in the soil across the seasons.

New Installation

The septic companies have received great reviews for new installations.

Hastings Seasonal Failure Patterns

Spring thaw and groundwater swings

A key reality in this area is that the timing of spring thaw aligns with naturally higher groundwater levels, which can choke a drain field's ability to accept effluent just when soils are at their most saturated. In practice, that means a conventional or gravity system may sit idle or underperform for weeks as the ground floods or muds up the soil profile. Homes with marginal soils or aging components realize this conflict most acutely, because the system has less soil air space to treat and disperse water. If a drain field has a history of slow drainage in late winter and early spring, plan for a slowed schedule of wastewater disposal in those weeks and be prepared for potential surges when the frost finally leaves and soils begin to drain.

Autumn rain events and field loading

Heavy autumn rainfall in Barry County can saturate soils long after the growing season has begun to wind down. When the ground remains saturated, pump-outs and maintenance become more challenging, and a system's performance can dip just as homeowners might lean on the system to handle holiday loads or increased indoor use. The combination of damp soils and a drained effluent plume can push a field toward reduced infiltration capacity. This means that pump-out timing, soil checks, and field monitoring should be coordinated with the fall moisture cycle, especially if the property relies on a shallow or marginally functioning component.

Winter frost and access constraints

Michigan winters bring frost depth and frozen access that can disrupt both installation schedules and ongoing maintenance. Access to the septic tank for pumping or inspection may be hindered by snowpack or frozen driveways, delaying essential upkeep or repairs. Frozen soils also limit the ability of a new field to establish proper drainage and can complicate the siting process for any required design adjustments. The consequences are twofold: existing systems may experience longer recovery times after freeze-thaw cycles, and delayed maintenance can exacerbate minor issues into more significant troubles when spring thaw finally arrives.

Summer dryness and heightened loading

Dry summers alter soil moisture profiles in ways that can stress a drain field. When soils dry out, the moisture gradient shifts, and the remaining moisture pockets can create uneven distribution of effluent, especially on older or mis-sized systems. Conversely, periods of heat and low rainfall can cause perched water to move differently, potentially increasing loading stress on the most vulnerable portions of the field. In practice, summers demand closer attention to usage patterns, lawn irrigation balance, and any landscape changes that might draw moisture from the root zone near the drain field, which can indirectly affect soil structure and drainage capacity.

Practical implications for Hastings homeowners

Seasonal patterns in Hastings mean that a single design choice or maintenance plan rarely suffices across the year. The spring and autumn transitions are the most critical periods to observe, with groundwater and soil moisture swinging enough to mask or reveal underlying field limitations. This locality's glacial soil pockets-loam, silt loam, and occasional clay-also contribute to uneven percolation, so a field that behaves well one season can underperform the next if weather patterns shift or if the system ages. Regular soil moisture checks near the drain field, timely pump-outs before expected heavy load periods, and a realistic assessment of field capacity during the driest and wettest months will reduce the risk of long-term failures. Remember that small, early indicators-sudden damp patches, slow draining fixtures, or gurgling noises-should prompt attention before conditions compound during the next seasonal swing.

Emergency Septic Service

Need a septic pro in a hurry? These have been well reviewed in emergency situations.

BEDHD Permits and Barry County Inspections

Permits for septic systems in this area are governed by the Barry-Eaton District Health Department (BEDHD) rather than the city. That means your project moves through BEDHD's review and approval process, with local site conditions driving the design approach. In practice, that translates to a focus on how the ground behaves across seasons here, where glacial soils can vary from loamy to clay pockets and where spring groundwater rises and falls can dramatically affect whether a given lot can support a conventional drain field or requires an alternative design.

New-system plans typically need a soils evaluation and a system design review before BEDHD issues the permit. The soils work in Barry County is not a one-size-fits-all step; it is a critical determinant of whether a gravity, conventional, or more advanced layout will work long term. In Hastings, the soils can swing between suitable conditions for conventional fields in some lots to the need for mound, chamber, or pressure distribution on others. The evaluation should clearly document seasonal groundwater behavior and soil permeability so the design team can tailor the system to the site realities.

Installations are inspected at key milestones and again at final completion, with winter installations often limited in Barry County and plan reviews commonly taking about 1 to 2 weeks depending on workload. Typical inspection milestones include the initial trenching and bedding, backfill and cover, and the final setback and functional testing to confirm proper operation. The timing of these inspections can be sensitive to weather and access conditions, particularly when frost or saturated soils limit trench work. Planning for inspections should align with anticipated construction milestones to avoid delays.

Because Hastings sits within a landscape where spring groundwater can surge and recede, BEDHD looks closely at seasonal groundwater data and the completed soil evaluation to ensure the chosen design remains functional through expected conditions. If the plan is to install in late fall or early spring, expect BEDHD to scrutinize drainage considerations and to verify that the design accounts for groundwater fluctuations. Engaging early with BEDHD and coordinating a thorough soils assessment helps prevent delays and ensures the installation remains compliant as seasons shift.

Hastings Septic Cost Drivers

Baseline installation ranges one can expect

In this area, typical local installation ranges are $9,000-$18,000 for gravity systems, $10,000-$22,000 for conventional systems, $12,000-$22,000 for chamber systems, $14,000-$28,000 for pressure distribution systems, and $25,000-$40,000 for mound systems. Those figures reflect Hastings' mix of glacially mixed loam, silt loam, clay pockets, and sandy outwash, where soil behavior and groundwater influence choices on every lot. If a lot starts as a straightforward conventional layout, a nearby test hole or percolation test can still reveal a soil limit that pushes the project into a more complex design. Costs climb quickly when a planned field must be replaced by a more explicit distribution method to ensure long-term reliability.

What soil and water swing mean for cost

Costs rise locally when a lot's glacially variable soils or seasonal wetness push a project from a conventional layout into pressure distribution or mound design. A typical Hastings lot can swing between an affordable gravity or conventional install and a higher-cost solution if groundwater fluctuates with the season or if the soil has pockets that drain poorly or hold water longer than expected. In practical terms, a soil profile that looks workable in dry late summer may choke a traditional drain field in spring when groundwater rises. That swing is a primary driver behind higher-price designs such as mound or pressure distribution systems.

Scheduling and winter considerations

Winter timing can also affect scheduling because Barry County installations are often limited when soils are frozen or snow-covered. If the soil is near the tipping point between conventional and pressure distribution, winter delays can push the project into a season with higher demand and tighter contractor availability, which may indirectly impact overall costs via scheduling flexibility. Bearing this in mind helps homeowners plan ahead and avoid rushed decisions that lock in the most expensive options unnecessarily.

Permits and local fees

Permit costs in the Hastings area typically run about $200-$600 through BEDHD. While not the largest line item, agent and inspection costs accumulate as the system type escalates. If the design moves from a traditional layout to a mound or chamber due to soil constraints, the incremental permit-related expenses can appear modest at first glance but align with the higher system costs once the final design is set.

Practical takeaway for planning

When budgeting, assume the lowest end for gravity or conventional options only if soils and groundwater testing come back straightforward. If early assessments reveal seasonal wetness or variable soil pockets, set aside funds for a pressure distribution or mound scenario. Expect the project to land somewhere between $9,000 and $40,000 depending on soil behavior and final design choice, plus $200-$600 in BEDHD-related permit costs. Planning with these ranges in mind helps align expectations with Hastings' unique soil and water dynamics.

Best reviewed septic service providers in Hastings

  • Butler's Rooter

    Butler's Rooter

    (616) 828-1708 www.butlersrooterllc.com

    Serving Barry County

    5.0 from 695 reviews

    Butler's Rooter, LLC performs all types of plumbing repairs, including installing fixtures, pipes, water heaters, plumbing repair, drain and sewer cleaning, and more in Grand Rapids and the Mid-Michigan area.

  • Advantage Plumbing & Drain, LLC & Advantage Electrical Contractors

    Advantage Plumbing & Drain, LLC & Advantage Electrical Contractors

    (269) 945-0300 advantageplumbinganddrain.com

    1690 E State St, Hastings, Michigan

    4.8 from 169 reviews

    Advantage Plumbing and Drain is a family owned and operated business, proudly serving West Michigan since 2004. Our three founding principles is where it all began — hard work, honesty and integrity. As licensed, expert plumbing technicians, we approach each job professionally and on-time. Our business is dedicated to customer care, communication and supplying high quality plumbing services on a budget, that works well for each of our clients so they know we’ve got their best interest in mind. We are proud to do each job right, the first time! From plumbing, septic systems, excavating, sewer and water line repair to porta-john toilet rentals, Advantage Plumbing and Drain has you covered. Now offering full electrical services since 2022.

  • Ball Septic Tank Service

    Ball Septic Tank Service

    (517) 280-1191 www.ballsepticservices.com

    Serving Barry County

    4.7 from 145 reviews

    Ball Septic Tank Service is a locally owned and offers Septic Tank Cleaning, Cleaning, Pumping, Septic Pumping, Septic Tank Repair, Septic Draining, Residential Septic Tank Cleaning, Commercial Septic Tank Cleaning, and other Septic Tank Services in Charlotte, Grand Ledge, Mason & the Greater Lansing Area. Here at Ball Septic Tank Service, our mission is always to provide quality service at an affordable price. With our years of experience in the industry, you can be sure you are getting the best service around. The success of our company is due to the dedication we provide to our customers. No matter the job, customer satisfaction is always our number one priority! Give us a call today for a free estimate!

  • Wilbur's Plumbing

    Wilbur's Plumbing

    (269) 763-3863 wilbursplumbing.com

    Serving Barry County

    4.8 from 106 reviews

    Did a water pipe burst in your home? Do you need help installing your new plumbing? Choose Wilbur's Plumbing, with over 30 years of industry experience, for professional plumbing services in the Battle Creek, MI area. If you need a sink or shower repaired, a water heater replaced or a water softener system installed, we’ve got you covered. We have the tools and experience needed to complete your plumbing repair and installation projects in a timely manner. Call 269-763-3863 today to speak with a reliable plumber and schedule the plumbing services you need.

  • Apex Septic & Excavating

    Apex Septic & Excavating

    (517) 997-6997 apex-mi.com

    Serving Barry County

    4.9 from 79 reviews

    Excavating, Drain field Installation, Septic system Installation and Repair. Septic tank pumping and cleaning. Private roads and driveway installation, repair and grading. We dig Basements and Foundations, backfill and final grade. Dozer and skid steer services. Yard restoration, Final grading, Grass seeding and Lawn installation.

  • Joe & Barb's Septic Services

    Joe & Barb's Septic Services

    (269) 945-4240

    3305 W Quimby Rd, Hastings, Michigan

    4.4 from 51 reviews

    We are a family owned and operated septic tank service. Our family has been in the business for 70 years. John Curtis and Joe Lyons are here to service all of your septic tank needs. We pump both Commercial and Residential Septic Systems. We also do baffle and line repairs. Joe & Barbs Septic Service is here to help you with all of your Septic tank needs! We are available 24 hours 7 days a week. We do not charge an emergency fee for evenings, weekends, or holidays.

  • AdeptSeptic Services

    AdeptSeptic Services

    (888) 800-1472 www.adeptseptic.com

    Serving Barry County

    5.0 from 35 reviews

    Experience unparalleled septic system solutions with AdeptSeptic Services - Barry County, MI's trusted choice for septic tank maintenance and installations. Our licensed and insured professionals prioritize continuous customer education and excel in septic tank pumping, inspections, cleaning, and repairs, guaranteeing well-informed decisions. We extend our services beyond the ordinary, offering septic system excavations, riser installations, effluent filter services, and even sanitary tee repairs and replacements. Our expertise and dedication ensure every client enjoys a reliable septic system, allowing them to rest assured that their properties' sanitation needs are in the hands of true experts.

  • Grade Excavating

    Grade Excavating

    (616) 745-6140 www.gradeexcavatingmi.com

    Serving Barry County

    5.0 from 12 reviews

    Grade Excavating is a local excavation, septic, and site work contractor, located in the Grand Rapids area. We offer a wide range of services, including: land clearing, foundation excavation, septic installs/replacements, concrete/asphalt removal, driveway grading, pole barn pads, drainage work, and bulk material hauling. With an emphasis on customer service, we pride ourselves in being responsive and punctual through all facets of the project. Give us a call today for all of your earth work needs!

  • Cook Brothers Excavating

    Cook Brothers Excavating

    (517) 647-6255 www.cookexcavating.com

    Serving Barry County

    5.0 from 10 reviews

    For more than 50 years, Cook Brothers Excavating has been proud to provide expert excavating services for many satisfied Michigan residential, agricultural and commercial customers. Cook Brothers Excavating works closely with many residential builders and construction sub-contractors. All of our landscaping products and excavating services are also available to the public. You can count on Cook Brothers Excavating to provide quality service and deliver affordable residential excavating and landscaping projects on time and on budget. Cook Brothers Excavating affordable landscaping products can be ordered by the yard and will be hauled to your location by experienced drivers. Determine the best location for your landscape products to be de...

  • RB Excavating

    RB Excavating

    (269) 945-9901 www.rbexcavating.com

    1633 S Hanover St, Hastings, Michigan

    4.7 from 3 reviews

    RB Excavating provides experienced residential/commercial excavation services, as well as propane tank sales for your grill/fire pit, camper, RV, or industrial needs to the Hastings, MI area.

  • Innerlakes Construction

    Innerlakes Construction

    (248) 379-7083

    Serving Barry County

     

    1 Stop builders from Excavating to Tree Service to the custom home to the dream home and Home Inspection septic system decks

Maintenance Timing for Hastings Systems

Baseline interval

For Hastings-area homes, the local recommendation baseline is a 3-year pumping interval. This cadence keeps solids under control in a wide range of soils and groundwater conditions found across Barry County, where glacial loam, silt loam, clay pockets, and sandy outwash influence how a drain field behaves over time. Use this baseline as your starting point, and adjust only after confirming site-specific results with your septic contractor or service provider.

System type considerations

Because Barry County has a mix of conventional gravity and advanced systems such as mound, chamber, and pressure distribution, pumping interval and inspection timing can shift based on the actual system on site. Gravity systems and conventional tanks often align with the 3-year guideline, while mound or chamber layouts can experience changes in sludge and scum buildup differently due to soil loading, recharge rates, and intermittently higher groundwater presence. If your inspector notes rapid solids accumulation or unusual field moisture during an onsite visit, plan to shorten the interval and coordinate with a service plan that fits the soil and load conditions on your lot.

Seasonal timing and field access

Spring is a common local window for pump-outs and field-related inspections because thawed access and seasonal saturation make performance issues easier to catch than during frozen winter conditions. Target a pump-out soon after snowmelt when the ground has softened but before any heavy spring use or rainfall peaks. If a soil or groundwater swing has left your field marginal, spring visits should be paired with a thorough field inspection to assess the drain field's ability to drain and dry between cycles.

Scheduling and communication

Coordinate with a Hastings-area septic professional who is familiar with glacial soil variability and spring water swings to set a precise timing plan. Annual check-ins, even if an immediate pump is not required, help track changes in the tank's contents and the field's performance. If any signs of backup, slow drainage, or wet spots appear after spring thaw, address them promptly to avoid compromising the system during peak growing seasons.

Riser Installation

Need someone for a riser installation? Reviewers noted these companies' experience.

Older System Diagnostics in Hastings

Access and surface visibility

The active local market for riser installation signals that many homes still lack easy surface access to the septic tank for routine service. Riser placement improves inspection, pumping, and maintenance in a area where seasonal spring groundwater can shift soil moisture and affect access pathways. Homeowners should plan for potential riser upgrades when older systems sit flush with pavement, lawn, or mature landscaping, and when access points are difficult to locate without digging. In Hastings, upgrading access is often a practical step that reduces the frequency of invasive, unexpected service calls.

Locating buried components

Electronic locating appears in the local service mix, pointing to older properties or buried components that are not always obvious from the surface. Layered soils in Barry County-glacial loams, silt loams, clay pockets, and sandy outwash-can complicate locate work, so relying on surface cues alone may miss critical features. When a tank or interceptor is suspected but not visible, a calibrated locator should be used, and exploratory digging should be planned with care to minimize disturbance in lawn areas and driveways.

Diagnostic approaches and where they fit

Camera inspection and hydro-jetting are present but less prevalent than pumping, indicating diagnostic line work is needed in some cases without defining the whole market. In Hastings, camera runs can identify root intrusion, sediment buildup, or collapsed lines that pumping alone cannot reveal. Hydro-jetting can clear minor blockages and restore flow, yet the climate-driven seasonal water table means some lines may re-silt or re-foul after a jet. For drain fields that operate intermittently or fail with spring groundwater swings, combining pumping with targeted camera inspection provides a clearer picture of long-term performance.

Soil and groundwater context

The glacially mixed soils produce variable drain-field outcomes from lot to lot. Spring groundwater swings can raise the water table enough to impede conventional drainage on some parcels while leaving neighboring parcels suitable for a standard gravity or conventional system. Diagnostics should account for this site-to-site variability, documenting soil textures, depth to groundwater, and seasonal changes observed during inspection windows. This localized understanding helps determine whether targeted diagnostics or a more robust design option is warranted to ensure long-term performance.

Need a camera inspection?

These companies have been positively reviewed for their work doing camera inspections of septic systems.

Hastings Commercial Septic Needs

Local market landscape and service mix

Commercial septic work is a meaningful portion of the local provider mix in this area, not limited to residential pumping. Hastings hosts a diverse set of commercial properties that rely on septic systems, from small mixed-use buildings to food-service sites with daily waste streams. The presence of reliable, timely service for commercial accounts helps ensure systems stay functional between septic cycles and through seasonal fluctuations in groundwater. In practice, you should expect faster response times for commercial calls and a level of logistical coordination not always needed for single-family homes.

Grease traps and food-service considerations

Grease trap service is a recurring and important demand in Hastings. Food-service properties-dining rooms, bakeries, and institutional kitchens-may require more frequent maintenance, pump-outs, and trap inspections than typical residential setups. A dedicated grease trap maintenance plan can prevent odor issues, reduce solids loading to the septic system, and extend the life of the drain field. Coordinate trap cleaning with your primary septic service provider to align pump schedules and avoid unexpected downtime during peak business hours. For commercial properties, the trap location, accessibility, and pumping frequency should be documented in the service agreement so staff can anticipate service windows.

Soil and groundwater dynamics affecting commercial drains

Barry County's glacial soils-ranging from loam to silt loam, with clay pockets and sandy outwash-produce variable drain-field performance across parcels. In Hastings, a commercial site may experience long seasons when a conventional field is feasible and neighboring lots require mound or chamber designs due to spring groundwater swings. For a commercial system, this means a pre-purchase or retrofit assessment should consider seasonal high water and soil percolation rates. When the seasonal groundwater schedule shifts, you may need to adapt by selecting a drain-field type capable of handling fluctuating moisture and loading.

Planning for BEDHD-aligned reliability

Commercial workloads sit alongside the broader Barry County compliance environment overseen by BEDHD. Regular inspections, maintenance records, and up-to-date pump-out schedules help demonstrate ongoing system stewardship. For Hastings properties, establishing a clear maintenance calendar and a dependable contractor network aids continuity of service, reduces the risk of failures during peak usage, and supports long-term system resilience across changing seasonal conditions.