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 June 11, 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