West Virginia · W. Va. C.S.R. §64-47-6
Septic system requirements in West Virginia
Tank sizes, drainfield rules, setbacks, permits, and real costs — pulled from West Virginia's own code rather than a national average.
- 3-bedroom tank
- 1,000 gal
- Design flow
- 150 gpd/BR
- Typical install
- $6,500–$18,000
- Permit fee
- $100–$400
- Well setback
- 100 ft
- Permitted by
- County / local
Septic tank sizes required in West Virginia
West Virginia sizes systems on a design flow of 150 gallons per day per bedroom. The tank must meet both the bedroom table below and a 2× daily-flow detention requirement — whichever produces the larger number governs.
| Bedrooms | Design flow | Code minimum | Recommended |
|---|---|---|---|
| 1 bedroom | 150 gpd | 1,000 gal | 1,000 gal |
| 2 bedrooms | 300 gpd | 1,000 gal | 1,000 gal |
| 3 bedrooms | 450 gpd | 1,000 gal | 1,000 gal |
| 4 bedrooms | 600 gpd | 1,000 gal | 1,250 gal |
| 5 bedrooms | 750 gpd | 1,250 gal | 1,500 gal |
| 6 bedrooms | 900 gpd | 1,500 gal | 2,000 gal |
Source: W. Va. C.S.R. §64-47-6. The recommended column rounds the governing requirement up to a tank size manufacturers actually stock.Run your own numbers →
Drainfield size and cost by soil type
For a three-bedroom home in West Virginia at 450 gpd. This single table explains most of the variation between quotes — the area scales inversely with how fast your soil accepts water, and the drainfield is the largest line item in the job.
| Soil | Loading rate | Absorption area | With reserve | Typical total install |
|---|---|---|---|---|
| Medium sand | 0.8 gpd/ft² | 563 ft² | 1,126 ft² | $10,500 |
| Sandy loam | 0.5 gpd/ft² | 900 ft² | 1,800 ft² | $13,300 |
| Loam | 0.4 gpd/ft² | 1,125 ft² | 2,250 ft² | $15,200 |
| Silt loam | 0.3 gpd/ft² | 1,500 ft² | 3,000 ft² | $18,400 |
| Clay loam | 0.2 gpd/ft² | 2,250 ft² | 4,500 ft² | $24,800 |
Estimates use West Virginia's cost index of 0.94× the national average. Build a line-item estimate →
Permits and who issues them
County health departments issue permits under 64CSR47, administered by the Bureau for Public Health.
| Permit required | Yes |
|---|---|
| Typical fee | $100 – $400 |
| Soil evaluation | Required before permit |
| Licensed installer | Required |
| Turnaround | 2–5 weeks |
| Ongoing inspection | Not mandated statewide |
| Reserve area | 100% replacement area required |
Minimum setback distances
Measured horizontally from the drainfield unless noted. Local rules are frequently stricter, and on a small lot these numbers — not the soil — often decide the layout.
| Private water well | 100 ft |
|---|---|
| Well (septic tank) | 50 ft |
| Property line | 10 ft |
| Surface water | 50 ft |
| Building foundation | 10 ft |
Regulatory contact
West Virginia Bureau for Public Health — Environmental Health Services
oehs.wvdhhr.org · 304-356-4300
What makes septic hard in West Virginia
Steep mountain terrain leaves very little flat, well-drained ground, and slope alone disqualifies many otherwise buildable sites.
Shallow soil over shale and sandstone limits both depth and treatment capacity.
Former mining land can have disturbed, unpredictable soil profiles and acid drainage.
Things that catch people out
- The tank-to-well setback is 50 feet but the drainfield-to-well setback is 100 feet — on a narrow hollow lot that difference decides the layout.
- The rules moved from 64CSR9 to 64CSR47; older references describe superseded requirements.
West Virginia septic questions
What size septic tank do I need in West Virginia?
A three-bedroom home in West Virginia requires a minimum 1,000 gallon tank under W. Va. C.S.R. §64-47-6. Design flow is 150 gallons per day per bedroom, and the tank must also hold 2 times daily flow, so the practical recommendation is 1,000 gallons.
Do I need a permit for a septic system in West Virginia?
Yes. County health departments issue permits under 64CSR47, administered by the Bureau for Public Health. Fees typically run $100 to $400, with a turnaround of about 2–5 weeks. A soil evaluation or percolation test is required before a permit is issued.
How much does a septic system cost in West Virginia?
A conventional system for a three-bedroom home typically runs $6,500 to $18,000 installed. Soil quality moves this more than anything else — on tight clay requiring a mound, budget two to three times the low end.
How far must a West Virginia drainfield be from a well?
100 feet from a private water well, with the septic tank itself allowed at 50 feet. Local rules can be stricter.
Sources
Every figure on this page traces to one of these documents.
- W. Va. C.S.R. §64-47-6 — Individual Sewage Systems · verified 2026-09-18
- W. Va. C.S.R. 64-47 — Sewage Treatment and Collection System Design Standards · verified 2026-09-18