What Reno requires the unit to be
Under RMC 12.16.555(b)(4), a gravity grease interceptor is an in-ground unit “located outside the facility,” “at least 750 gallons,” with baffles and “a minimum of two compartments.” Hydromechanical units “shall not be permitted in lieu of a gravity interceptor,” toilets and urinals may not drain through it, and written approval from the city is required before one is installed. Sparks has the same 750-gallon floor (SMC 13.30.020(E)).
Who may service it, and how
“Maintenance of gravity interceptors shall be done by a licensed plumber or contractor normally engaged in the servicing of such plumbing fixtures” (12.16.555(b)(6)(ii)c). Every visit removes the full contents — grease cap, water, settled solids — scrapes walls and baffles, checks the tees, and refills with clean water. Anything less leaves solids compacting below and a tank that reaches 25% far sooner than the paperwork suggests.
How often
Your Environmental Control permit specifies the frequency; the 25% rule applies on top of it (12.16.555(b)(6)(ii)a); and “the city may require more frequent cleaning” while a variance may allow less if you can demonstrate it is sufficient ((ii)b). The calculator estimates when your tank hits 25% from size and volume; the first pump-out’s reading calibrates it.
If it is not maintained
The code lets the city “authorize such maintenance work be performed on behalf of the industrial user,” with costs “billed directly to the tenant/owner” ((ii)d). A city-ordered pump-out costs more than a scheduled one and arrives with an inspection.
What you get after every visit
- Waste manifest / trip ticket with the hauler’s certification for the load (12.16.555(b)(6)(ii)f–g) — keep three years
- Gallons removed and the percent-full reading
- Condition notes on baffles, tees, lids and access