The county already published the calendar.

Rural Water Desk keeps that calendar for a state small water system, files the lab report against the row it belongs on, and prints one packet when someone asks for the file. A missed month is how a permit gets a letter. A missing well test is how a rental sale stalls.

Open the sample desk Ventura, monthly San Diego well

Who it is for

A park, ranch, or handful of houses on a state small permit Five to fourteen connections, permitted by the county under Health and Safety Code § 116275(n). The owner is the water system. Ventura’s bacteria sample is every month. The state floor, and Sonoma, are once a quarter.

A landlord on a private well, where the county publishes a test San Diego’s rental check is yearly total coliform and nitrate, not a state-small permit. The potable line the county uses for nitrate is 10 mg/L as nitrogen.

The well or pump company that gets the call The call comes after the letter, not before it. The desk is the file you hand back with the sample.

Five counties, not one statewide form

Each row is a published handout. If a county has not published the cycle, it is not in the desk.

County	Who	Bacteria	The rest
Ventura	State small	Every month	Nitrate and nitrite every year. Inorganics every 3 years. Asbestos and radioactivity every 9 years. County handout.
Riverside	State small	Quarterly or monthly, whichever the sample-siting plan checked	One source chemistry sample. The plan is a checkbox, not a guess. BSSP, Feb 2026.
San Bernardino	State small	Quarterly, the state floor	One source chemistry sample. The county’s 24-hour, three-repeat chart is the public-water chart, and it is not applied here.
San Diego	State small, or a private well	Quarterly on a state small system. Yearly on a private well.	A private well also has yearly nitrate. Well sampling guidance.
Sonoma	State small	Every quarter, reported by the 10th of the month after the sample was collected	Nitrate every year. Nitrite every 3 years. County page.

When coliform is present

A state small system takes one repeat at the same tap within 48 hours of the lab notice. If that repeat is also positive, it is analyzed for fecal coliform or E. coli, and the local health officer is told within 48 hours. That is 22 CCR § 64212(b). It is not the public-water rule of three repeats in 24 hours.

The sample desk opens on a Ventura system with that failure already on the file, a Riverside system whose bacteria sample is coming due, and a San Diego rental well whose yearly test is late.

See the open failure Riverside calendar