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Septic Systems for Campgrounds and RV Parks

A campground or RV park typically has two distinct wastewater sources that most states treat differently: bathhouse, restroom and laundry flow on one side, and RV dump-station waste on the other, and both need to be sized around peak-season occupancy rather than a year-round average.

Two waste streams, not one

Bathhouses, restroom buildings and any on-site laundry generate a flow that is calculated much like a multi-family or hotel building, driven by site count and expected occupancy. RV dump stations are a separate, concentrated waste stream, holding-tank contents discharged in a batch rather than continuously, and many states have a distinct design category or standard specifically for dump stations rather than folding that flow into the bathhouse calculation.

Treating both as one undifferentiated flow risks under-designing for the dump station's concentrated discharge even if the bathhouse side is sized correctly.

Seasonal peaking drives the real number

A campground that is empty in winter and fully booked in July has to be designed around the peak season's occupancy, not an annual average, since the system has to function correctly during the weeks it is actually stressed.

Who actually designs and permits this

Commercial and other non-residential onsite systems normally require a licensed septic or wastewater designer, and often a professional engineer, and are permitted by the county or state agency that regulates onsite wastewater where the property sits. We are not engineers, we are not a permitting authority, and nothing on this page is a design, an approval, or a substitute for that agency's review. The specific design-flow figures, tank-size minimums, grease-interceptor sizing rule and setback distances that actually apply are set by your state's code.

Find your state's septic regulator and permit sequence.

Start from the recorded system, not a guess

A new use, an addition, a remodel, a change of tenant, gets compared against what a commercial property is already permitted for. Where a recorded septic file exists for the property, it typically shows the tank size, the treatment components, the drainfield or dispersal area, and the design flow the system was approved for, which is the starting point for figuring out whether a change fits inside the existing approval or needs an upgrade. We publish where county septic records are kept and how many we hold, we list local septic companies by county, and we generate a free, code-referenced septic design for a parcel to use as a starting point.

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Common questions

Do RV parks need a separate design for the dump station?

Often yes; RV holding-tank waste is a concentrated, batch-discharged stream that many states handle under a distinct design category from bathhouse or restroom flow, rather than folding it into one combined number.

How is design flow set for a campground?

Around peak-season occupancy, since the system needs to work correctly during the busiest weeks, not just on an annual average.

Is campground bathhouse wastewater designed like a hotel's?

Similarly: driven by site count and expected occupancy in a way that resembles multi-family or hotel design more than a single-family calculation.

Page last reviewed 2026-08-31.