Nevada Administrative Code
Chapter 445A - Water Controls
ON-SITE SEWAGE DISPOSAL SYSTEMS
Operation and Monitoring of Systems
Section 445A.9656 - Septic tanks: Minimum capacity determined by projected daily sewage flow
Current through December 12, 2024
1. The minimum capacity of a septic tank used in an on-site sewage disposal system must be based on the projected daily sewage flow and other considerations specified in subsections 2 to 5, inclusive. The following table may be used to determine the projected daily sewage flow, using the occupancy that most closely resembles the anticipated occupancy of the building:
| TYPE OF OCCUPANCY | PROJECTED FLOW OF SEWAGE (GALLONS PER DAY) |
| Airports | 15 per employee and 5 per customer |
| Automobile washes (sand/oil interceptor required) | 5 per passenger vehicle |
| Bowling alleys | 150 per lane |
| Camps: | |
| Campground with central comfort station | 35 per person |
| With flush toilets, no showers | 25 per person |
| Day camps (no meals served) | 15 per person |
| Summer and seasonal | 50 per person |
| With cocktail lounge | Add 2 per meal served |
| With garbage disposal (not recommended) | Add 1 per meal served |
| With kitchen waste | Add 6 per meal served |
| With kitchen waste, disposable service | Add 2 per meal served |
| Schools: | |
| Teaching staff and other employees | 20 per person |
| Kindergarten or elementary school | 15 per pupil |
| Junior high school, middle school or high school | 20 per pupil |
| With gym and showers | Add 5 per pupil |
| With cafeteria | Add 3 per pupil |
| Boarding school (including all waste) | 100 per person |
| Service stations: | |
| With toilets | 1,000 for first bay |
| Each additional bay | Add 500 |
| Stores or shopping centers: | |
| Staff | 20 per employee |
| With public restroom | 1 per 10 square feet of floor space |
| Swimming pools (public) | 10 per person |
| Theaters and auditoriums: | |
| Indoor | 5 per seat |
| Drive-in | 10 per space |
2. If the projected daily sewage flow for the intended occupancy is 3,000 gallons or less per day, the minimum capacity of the septic tank must be equal to the projected daily sewage flow multiplied by 1.5.
3. If the projected daily sewage flow for the intended occupancy is more than 3,000 gallons per day, the minimum capacity of the septic tank must be equal to the projected daily sewage flow, with an additional sludge storage volume of 1,500 gallons.
4. If the projected daily sewage flow includes waste from recreational vehicles, the minimum capacity of the septic tank must be equal to the projected daily sewage flow multiplied by 2, to provide sufficient treatment capacity for the generally higher strength of recreational vehicle sewage and the common sanitary solution additives that inhibit microbial activity. In addition, increased pumping frequency must be specified in the operations and maintenance manual prepared pursuant to NAC 445A.970.
5. Septic tanks serving establishments with high sewage volume, including, without limitation, restaurants, convenience stores and service stations located near interstate highway exits, require special sizing considerations. The minimum capacity of such a septic tank must be equal to the projected daily sewage flow multiplied by 3.
Added to NAC by Environmental Comm'n by R194-07, eff. 8-26-2008
NRS 445A.425
