Is Simi Valley, CA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for Ventura County Waterworks District No. 8 – Simi Valley.
2 public water systems serve parts of Simi Valley. The largest, Ventura County Waterworks District No. 8 – Simi Valley, serves 94,736 people. Your water bill names your system.
Largest system
Ventura County Waterworks District No. 8 – Simi Valley
94,736 people · Purchased surface water · EPA ID CA5610023
Buys treated water from Calleguas Municipal Water District.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Full Ventura County Waterworks District No. 8 – Simi Valley results
Across California, 129 of 691 water systems EPA tested had PFAS above a 2024 federal limit, and 26 systems were above the lead action level in results from the last five years. California results.
Simi Valley homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Simi Valley city (tables B25034, B25003). Estimates for small places have a margin of error.
Other water systems serving Simi Valley
- Golden State Water Company – Simi Valley45,086 people · Purchased surface water · California · reported ZIPs hereLithium above screening level
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Moorpark 7 mi Ventura Cwwd No. 1 – Moorpark Water System | None above limits | 0 ppb |
| Thousand Oaks 9 mi Las Virgenes Municipal Water District | None above limits | 0 ppb |
| Camarillo 16 mi Camarillo Water Dept | None above limits | 0 ppb |
| Santa Clarita 18 mi Santa Clarita Valley Water Agency | Above limit | 0 ppb |
| Santa Paula 19 mi City of Santa Paula | None above limits | 0 ppb |
| Santa Monica 23 mi City of Santa Monica Water Division | None above limits | 1.4 ppb |
Simi Valley ZIP codes (2)
- 93063
- 93065
Questions
Is Simi Valley tap water safe to drink?
Ventura County Waterworks District No. 8 – Simi Valley has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Simi Valley, CA?
2 public water systems serve parts of Simi Valley. The largest is Ventura County Waterworks District No. 8 – Simi Valley (94,736 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Simi Valley tap water have PFAS?
None detected above EPA's reporting limits. Ventura County Waterworks District No. 8 – Simi Valley had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Simi Valley homes have lead pipes?
Census estimates put 50% of Simi Valley homes as built before 1980 (California: 56%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Ventura County Waterworks District No. 8 – Simi Valley's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.