Nevada · NAC 444.8306
Septic system requirements in Nevada
Tank sizes, drainfield rules, setbacks, permits, and real costs — pulled from Nevada's own code rather than a national average.
- 3-bedroom tank
- 1,000 gal
- Design flow
- 150 gpd/BR
- Typical install
- $9,000–$25,000
- Permit fee
- $300–$1,200
- Well setback
- 100 ft
- Permitted by
- County / local
Septic tank sizes required in Nevada
Nevada 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 | 1,200 gal | 1,250 gal |
| 5 bedrooms | 750 gpd | 1,500 gal | 1,500 gal |
| 6 bedrooms | 900 gpd | 1,500 gal | 2,000 gal |
Source: NAC 444.8306. 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 Nevada 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 | $12,000 |
| Sandy loam | 0.5 gpd/ft² | 900 ft² | 1,800 ft² | $15,100 |
| Loam | 0.4 gpd/ft² | 1,125 ft² | 2,250 ft² | $17,200 |
| Silt loam | 0.3 gpd/ft² | 1,500 ft² | 3,000 ft² | $20,700 |
| Clay loam | 0.2 gpd/ft² | 2,250 ft² | 4,500 ft² | $27,700 |
Estimates use Nevada's cost index of 1.03× the national average. Build a line-item estimate →
Permits and who issues them
Southern Nevada Health District, Washoe County, and the state Division of Environmental Protection each permit their own areas under NAC 444.
| Permit required | Yes |
|---|---|
| Typical fee | $300 – $1,200 |
| Soil evaluation | Required before permit |
| Licensed installer | Required |
| Turnaround | 2–6 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 | 5 ft |
| Surface water | 50 ft |
| Building foundation | 5 ft |
Regulatory contact
Nevada Division of Environmental Protection — Onsite Sewage Disposal
ndep.nv.gov · 775-687-4670
What makes septic hard in Nevada
Caliche hardpan across the southern valleys is expensive to break and can perch water above the drainfield.
Nitrate loading in the Las Vegas and Pahrump valleys has led to density limits on new septic systems.
Las Vegas has an active programme converting septic properties to sewer, sometimes with mandatory connection.
Things that catch people out
- Nevada adds only 150 gallons per bedroom above six, which is lower than most states.
- If sewer becomes available within a set distance of your property in Clark County, you may be required to connect and abandon the septic system.
Nevada septic questions
What size septic tank do I need in Nevada?
A three-bedroom home in Nevada requires a minimum 1,000 gallon tank under NAC 444.8306. 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 Nevada?
Yes. Southern Nevada Health District, Washoe County, and the state Division of Environmental Protection each permit their own areas under NAC 444. Fees typically run $300 to $1,200, with a turnaround of about 2–6 weeks. A soil evaluation or percolation test is required before a permit is issued.
How much does a septic system cost in Nevada?
A conventional system for a three-bedroom home typically runs $9,000 to $25,000 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 Nevada 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.
- NAC 444.8306 — Capacity of septic tank serving single-family dwelling · verified 2026-09-18
- NAC Chapter 444 — Sanitation — Sewage Disposal · verified 2026-09-18