Simi Valley, Ventura County
Simi Valley Plumbing Runs Into a Rule That Stops Halfway Across the City
This site has already asked the Ventura County question twice. Our Camarillo and Thousand Oaks pages both open by telling you to find out which agency actually sells you water, because a city boundary and a service boundary are not the same line. Simi Valley is one step past that, and the step is a big one.
Here the City publishes a set of water rules, and then publishes a sentence saying that if you are a Golden State Water customer you should go and read that company’s requirements instead. Roughly forty per cent of the city is in that position. The City is not being unhelpful. It is being accurate, because it has no authority over that forty per cent.
The other sixty per cent is served by Ventura County Waterworks District No. 8, which the City manages, and whose Board of Directors is the City Council. So one part of town buys water from a body you can vote for, and another part buys it from a private company. The pipe in the street looks identical. Everything written about it is not.
Where the line matters and where it does notCalifornia coverage
The Lead Fact
A Water District Whose Board of Directors Is the City Council
The City states its position without any hedging. Waterworks services in Simi Valley are currently provided through two suppliers: Golden State Water Company, and the City of Simi Valley acting through Waterworks District No. 8. Approximately sixty per cent of the city is served by the District, which is managed by the City, with the City Council serving as its Board of Directors. Golden State Water Company is a private company that provides water service to the other forty per cent.
That is an unusual sentence to find on a municipal website, and it is worth reading slowly. The same seven people who sit as the City Council also sit as the board of a water utility. When they set a water rate they are not acting as the city government at all, they are acting as the directors of a county waterworks district that the city happens to run. Two roles, one room.
What the District actually owns
The District delivers over 23,000 acre-feet a year to 24,000 service connections. It holds 40 storage facilities such as water tanks, 2,700 fire hydrants, 18 pump stations and 357 miles of water pipe. Its main source of water is the Calleguas Municipal Water District, and it also owns two wells in the Tapo Canyon area which supply the Tapo Canyon Water Treatment Plant.
On 22 June 2026 the Board of Directors of Waterworks District No. 8 adopted a 2025 Urban Water Management Plan and a 2025 Water Shortage Contingency Plan. The City explains why both exist: state law requires every urban water supplier to adopt them every five years, the management plan assessing supply reliability and demand over a 25 year horizon and the contingency plan setting out what the agency will do during a shortage.
The practical effect shows up in the smallest places. The City runs a water waste reporting form, and it tells you that if you are certain the waste is happening in the Golden State Water service area you should report it to Golden State Water directly. If you are not sure which area it is in, fill in the City form anyway and staff will make sure the proper agency is notified. Even reporting a broken sprinkler starts with a jurisdiction question.
Sorted by whether the boundary matters
Four Simi Valley Plumbing Questions, and the Line Only Changes Two of Them
The temptation with a split city is to assume the split runs through everything, and people here do assume that. It does not. Water arrives from two organisations and everything else in the plumbing chain is single and citywide. Sorting the questions this way is quicker than sorting them by department.
Which conservation rules apply to your house
The City publishes permanent mandates and a Stage I water supply condition for its own District customers, then directs Golden State Water customers to that company for its requirements. Two sets of rules inside one set of city limits.
The line matters.
Who you report water waste to
Report it to Golden State Water directly if you are certain it is in their area. If you are not certain, use the City form and staff will pass it to the right agency. The City has published a Water Supplier Service Area Map for exactly this reason.
The line matters.
Who inspects your plumbing work
The Building and Safety Division reviews plans and inspects against the California Building, Electrical, Plumbing, Mechanical and Energy Codes across the whole city. Your water supplier has nothing to do with who signs off a repipe.
The line does not matter.
Who runs the sewer and treats what leaves your house
The City Sanitation Services Division operates the sewer system and the Water Quality Control Plant 24 hours a day, 365 days a year, for the whole city. Water arrives from two organisations. It leaves through one.
The line does not matter.
A Rule With a Future Tense
Irrigation That Is Legal Today and Will Not Be
Most water rules on this site are either permanently in force or attached to a drought stage that can be lifted. The City publishes a third kind, and it is the one that turns into irrigation work. Assembly Bill 1572 prohibits the use of potable water to irrigate non functional turf, and it arrives in four steps rather than all at once.
We are not going to define non functional turf from scratch here, because our Corona page already covers the state conservation regulation that brought the idea in for commercial, industrial and institutional customers. What Simi Valley publishes that is worth having is the schedule, and one extension in it that catches a lot of households by surprise.
The dates run from 1 January 2027 for properties owned by local governments, local and regional public agencies and public water systems, to 1 January 2028 for other institutional, commercial and industrial properties, to 1 January 2029 for the common areas of homeowners association properties, common interest developments and community service organisations. A later date of 1 January 2031 applies to public bodies in a disadvantaged community, or the date on which a state funding source is made available.
The 2029 line is the one to notice. A house in a common interest development is a private home, but the association common areas around it are not, and the irrigation serving them has a date on it. The City also quotes the definition that decides the question: non functional means the turf is solely ornamental and is not regularly used for recreation, sport, or civic or community events.
What Applies Right Now, If the District Bills You
Permanent Mandates, and the One That Is a Repair Deadline
The City adopted a Stage I water supply condition calling for voluntary conservation, effective 1 May 2023, and District customers are no longer required to follow a designated watering day schedule. That is worth stating plainly because two of our other Ventura County pages carry watering day schedules, and this city has removed its own.
Underneath the voluntary stage sits a set of mandates the City describes as permanent. They do not switch off when a drought ends, and several of them are plumbing conditions rather than behaviour requests.
- Water only before 9 a.m. and after 5 p.m., to reduce evaporation.
- No more than 15 minutes per irrigation zone per day, which the City states does not apply to low flow and high efficiency devices.
- Use multiple shorter cycles to eliminate excessive irrigation runoff.
- No watering during measurable rainfall, and for 48 hours after it.
- Fix all leaks, breaks or malfunctions within 7 days.
- Wash private vehicles only with a trigger shut off nozzle.
- No washing down hard or paved surfaces such as sidewalks and driveways.
- Recirculating water is required for decorative water features and fountains.
- No filling or refilling ornamental lakes or ponds, except to sustain aquatic life.
The seven day repair mandate is the one a plumber gets called about, and it is worth being honest about how it sits alongside the rest of this site. Our Camarillo page is built on a 72 hour clock and our Thousand Oaks page on a leak adjustment threshold, so this is the third leak deadline in one county and we are flagging that rather than dressing it up as a discovery.
What is genuinely different here is its nature. Camarillo and Thousand Oaks publish clocks attached to a billing adjustment, which is to say they are about money. Simi Valley publishes a standing requirement to repair, with no adjustment attached to it and no drought stage needed to activate it. It is a condition of service rather than an offer, and the exposure runs from the day the leak is found. Our leak detection page covers what finding one actually involves.
Where the Work Gets Looked At
The City Publishes Its Inspection Sequence, and Plumbing Appears in All of It
Building and Safety publishes the order it inspects in, and reading it changes how you schedule a job. This is not a list of plumbing inspections. It is the whole construction sequence, and plumbing turns up as a condition of passing nearly every stage.
The foundation inspection is the sharpest of them. It happens after the footing excavations are done and the forms and reinforcing steel are in place, and the City states that all underground drain and waste plumbing must be in place with a 10 foot high water test. A column of water ten feet tall standing in the drainage system is what proves it holds, and it has to be proved before there is any concrete anywhere near it.
At the slab inspection, all piping and conduit has to be protected from contact with concrete, and the inspection has to be performed and approved before placement. At frame inspection, all rough plumbing, fire sprinkler piping, mechanical, electrical and water piping must be completely installed with all required tests.
Then there is a separate sewer and water service connection inspection, made after the approved piping is in place and the appropriate test applied, and it must happen before any piping is covered. The City adds a sentence that is easy to skip and worth keeping: the Building Inspector of record may allow deviation from the standard process where site conditions justify it without adverse effect.
The Last Gate
Five Bodies Sign One Form Before Any Utility Is Released
On a new building or a change of use, the City states that the final inspection must be approved and all required parties must sign the Application for Certificate of Occupancy, which it calls the 801 form, before any utilities will be released. It then lists who signs, and the list is longer than most people expect.
The Ventura County Fire Protection District signs. Ventura County Environmental Health signs. Public Works signs twice, once as Sanitation and Environmental Compliance and once as the Inspection Division. The Planning Division signs. Five signatures, and two of them belong to a different government from the one that issued the permit.
The consequence is worth stating in the language a homeowner actually uses. The work can be finished, the plumbing can be connected and operable, and the water can still not be turned on, because a signature from a county department is missing. That is not a delay anybody can chase with a plumber.
The City also publishes what has to be true at final inspection: lot drainage complete, address posted, plumbing fixtures connected and operable, electrical fixtures in place, the insulation certificate posted, the structure clear of debris and stored construction materials, and wall finishes completed per the approved plans.
Booking and Being There
A 4 p.m. Cutoff, a Friday That Becomes Tuesday, and Half an Hour to Reach a Human
Inspection requests go through a self service portal. The City states that requests received by 4:00 p.m. will be performed the following workday, and then adds the sentence that catches people out: inspections requested on Fridays after 4:00 p.m. will be conducted the following Tuesday. Miss a Friday afternoon by ten minutes and an open trench or an open wall sits through the weekend and a Monday.
There is a second published detail that is more useful than it looks. Inspectors may be reached in the office between 7:00 a.m. and 8:00 a.m. and between 4:00 p.m. and 4:30 p.m., Monday to Friday, to discuss project problems or to arrange a more precise time for the following workday. Very few cities publish a window in which the inspector is actually at a desk, and on a job where timing matters it is worth using.
The paperwork requirement is equally concrete. The contractor or owner builder is responsible for having a copy of the stamped approved plans at the job site for the inspector, and the City specifies the size: the plans must be 18 inches by 24 inches. A phone photograph of a drawing is not a set of plans on site.
Two more lines are worth knowing before anybody schedules. The contractor or owner builder is responsible for verifying that all work is complete and ready for inspection, and re-inspections are conducted by request after all corrections have been made. If your permit includes only one inspection, the City states you may be charged a re-inspection fee if an additional one is required.
The Other Direction
The Sewer Has No Split in It, and Its Permit Comes From the Wrong County
Whatever the supply side looks like, the drainage side of Simi Valley is single and citywide. The Sanitation Services Division, part of Public Works, works 24 hours a day and 365 days a year, and describes its two jobs as the sewer system buried under the city streets and the Water Quality Control Plant that treats what arrives.
The division is organised in three groups, which is a more useful thing to know than it sounds when you are trying to reach the right person: Sanitation Engineering plans and designs the systems, Operations covers collection and treatment, and Environmental Compliance handles the regulatory side.
A permit from the neighbouring region
The stormwater programme runs under a National Pollutant Discharge Elimination System permit, number CAS004004, and the City states it was issued by the Los Angeles Regional Water Quality Control Board. Simi Valley is in Ventura County, so its stormwater is regulated by the board next door, while the City also collaborates with the Ventura Countywide Stormwater Quality Management Program on countywide requirements.
Environmental Compliance also runs an Industrial Pretreatment Program that enforces the City’s Sewer Use Ordinance, monitoring, inspecting and reviewing how businesses discharge to the sewer. If you run a business here, what goes down your drains is inspectable, and the stated purpose is protecting the treatment plant rather than protecting the pipe.
Coverage
Simi Valley and the Rest of the Conejo and Simi Corridor
Neighbourhood names in this city do not tell you which water company bills the address, and we are not going to pretend they do. The City publishes a Water Supplier Service Area Map precisely because the boundary does not follow anything a resident would recognise. The only reliable test is the bill.
Downtown Simi Valley
Wood Ranch
Big Sky
Texas Tract
Santa Susana
Tapo Canyon
Sinaloa
Indian Hills
White Oak
Mountain View
Alamos
Knolls
Along the 101 corridor our Thousand Oaks and Camarillo pages cover the rest of Ventura County, including two leak adjustment schemes that work nothing like the standing repair mandate here. Over the county line to the east, Santa Clarita has a water rule that no other city on this site has. For the turf regulation itself, our Corona page covers the state conservation rule that started it.
For the work itself, see sewer line repair and drain cleaning, and the rest of the state on our California page.
Simi Valley Plumbing Questions, Answered Straight
Answers taken from what the City of Simi Valley publishes, with the boundary problem left visible rather than smoothed over.
Two organisations. The City states that waterworks services are provided through Golden State Water Company and the City of Simi Valley acting through Waterworks District No. 8. Approximately sixty per cent of the city is served by the District, which is managed by the City with the City Council serving as its Board of Directors. Golden State Water Company is a private company serving the other forty per cent.
Only if the District bills you. The City publishes its conservation requirements and then states that Golden State Water customers should visit that company’s website to view its requirements. It also publishes a Water Supplier Service Area Map. If you do not know which side you are on, the map and your bill are the two ways to find out.
The City states that the District delivers over 23,000 acre-feet a year to 24,000 service connections, with 40 storage facilities such as water tanks, 2,700 fire hydrants, 18 pump stations and 357 miles of water pipe. Its main source is the Calleguas Municipal Water District, and it owns two wells in the Tapo Canyon area supplying the Tapo Canyon Water Treatment Plant.
Yes, and it is a permanent mandate rather than a drought measure. Among the requirements the City lists as continuing regardless of stage is to fix all leaks, breaks or malfunctions within 7 days. Our Camarillo and Thousand Oaks pages carry different leak clocks attached to billing adjustments. This one is not an offer of an adjustment, it is a condition of service.
No. The City adopted a Stage I water supply condition calling for voluntary conservation effective 1 May 2023, and states that District customers are no longer required to follow a designated watering day schedule. The permanent mandates still apply, including the before 9 a.m. and after 5 p.m. window and the 15 minute limit per irrigation zone per day.
It prohibits using potable water to irrigate non functional turf, phased over four dates. The City lists 1 January 2027 for local government, public agency and public water system properties, 1 January 2028 for other institutional, commercial and industrial properties, 1 January 2029 for the common areas of HOA properties, common interest developments and community service organisations, and 1 January 2031 for public bodies in a disadvantaged community or the date a state funding source becomes available. Non functional means solely ornamental and not regularly used for recreation, sport or civic events.
More plumbing than most people expect. The City states the foundation inspection is conducted after excavations for footings are complete and all forms and reinforcing steel are in place, and that all underground drain and waste plumbing must be in place with a 10 foot high water test. All required anchors must also be fixed in place before approval.
At least three more times on a new build. At the concrete slab inspection all piping and conduit must be protected from contact with concrete, and the inspection must be approved before the pour. At frame inspection all rough plumbing, fire sprinkler piping, mechanical, electrical and water piping must be completely installed with all required tests. There is then a separate sewer and water service connection inspection, made after the approved piping is in place and tested, and before anything is covered.
By 4:00 p.m. for the following workday. The City adds that inspections requested on Fridays after 4:00 p.m. will be conducted the following Tuesday. Inspectors can be reached in the office between 7:00 a.m. and 8:00 a.m. and between 4:00 p.m. and 4:30 p.m., Monday to Friday, to discuss problems or arrange a more precise time.
Yes, and at a specified size. The City states that the contractor or owner builder is responsible for having a copy of the stamped approved plans at the job site for the inspector, and that the plans must be 18 inches by 24 inches.
Possibly because the 801 form is not fully signed. On a new building or a change of use the City states the final inspection must be approved and all required parties must sign the Application for Certificate of Occupancy before any utilities are released. Five bodies sign it: Ventura County Fire Protection District, Ventura County Environmental Health, Public Works as Sanitation and Environmental Compliance, Public Works as the Inspection Division, and the Planning Division.
The City, for all of it. The Sanitation Services Division operates the sewer system and the Water Quality Control Plant 24 hours a day, 365 days a year. Its stormwater programme runs under NPDES permit number CAS004004, which the City states was issued by the Los Angeles Regional Water Quality Control Board rather than the Ventura one.
What This Simi Valley Plumbing Page Read, and What It Would Not Say
Everything above was read on the City of Simi Valley website on 3 August 2026. The two supplier split, the sixty and forty per cent figures, the City Council sitting as the Board of Directors, the system figures and the Calleguas and Tapo Canyon sources come from the City Waterworks Services page. The permanent mandates, the Stage I condition, the AB 1572 compliance dates, the definition of non functional turf and the water waste reporting split come from the City Water Conservation page.
The sewer system, the Water Quality Control Plant and the three divisional groups come from the City Sanitation Services page. The Industrial Pretreatment Program, the Sewer Use Ordinance reference and the NPDES permit number and issuing board come from the City Environmental Compliance page. The inspection sequence, the 10 foot high water test, the plan size, the booking cutoff and the 801 form signatories come from the City Inspection Procedures page, and the code scope from the Building and Safety Division page.
A NOTE ON HOW THESE PAGES WERE READ. Both simivalley.org and www.simivalley.org return 403 to an ordinary request no matter what headers are sent. Everything here was read through a real browser engine on the same origin. We mention it because it means these pages are harder to check than most, and a reader who finds them unreachable is not imagining it.
REFUSED: every rate, every fee amount and every rebate figure other than the ones the City states directly. We did not open a rate schedule, a permit fee schedule or the Urban Water Management Plan and Water Shortage Contingency Plan documents, so no rate, no connection charge and no plan figure appears anywhere on this page.
REFUSED: any statement about Golden State Water Company beyond the fact that the City names it as the other supplier and directs its customers to it. We did not read that company’s website, we quote none of its requirements, and we make no claim about its rates or its regulator. Forty per cent of this city is described here only by what the City itself says about it.
REFUSED: any general explanation of what an investor owned water utility is. Our Chattanooga page covers a city supplied by one and the regulator that sits over it, and repeating that here would add nothing. What is unusual here is the split, not the private company.
REFUSED: the definition and rationale of non functional turf, which our Corona page already carries alongside the state conservation regulation adopted in July 2024. What is taken here is the AB 1572 schedule and the 2029 extension to homeowner association common areas, which is the part with a date on it.
A NEAR DUPLICATE WE ARE NAMING RATHER THAN HIDING. This is the third leak deadline this site carries in one county, after the Camarillo 72 hour clock and the Thousand Oaks adjustment threshold. We have kept the seven day mandate because it is a different kind of rule, a standing condition of service rather than a billing offer, and we have said so above rather than presenting it as a fresh discovery.
REFUSED: a boundary. We have not drawn the supplier line and we do not hold it. The City publishes a Water Supplier Service Area Map and that is the thing to look at. Every diagram on this page is a schematic of responsibility and is labelled as one.
A NOTE ON THE NAME. Simi Valley is a single referent with no namesake in any other state. The only corrections its search data needed were the removal of a national leak detection franchise and two local firms, one of which appears with the city name truncated to its first word and consequently filed under the wrong state entirely.
No office, crew, address or response time of ours is stated for Simi Valley, and no coverage claim is made beyond what our California page already sets out. Published rules, deadlines and compliance dates change, so confirm anything decision critical with the body that publishes it before acting on it.