Golden State Water Company - Simi Valley, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 6 ppb (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Golden State Water Company - Simi Valley at a glance
Golden State Water Company - Simi Valley serves about 45,086 people through 13,862 service connections, which makes it a large system under EPA's size classes. It is privately owned and draws surface water, in Ventura County, California. EPA system ID: CA5610059; phone on file: 916-853-3615. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 6 ppb from 0 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Golden State Water Company - Simi Valley is 8.9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 6 ppb |
| 2023 | 0 (not detected) |
| 2020 | 8.9 ppb |
| 2017 | 6 ppb |
Where this result ranks
Of the 2,884 California systems with a lead result, the median latest reading is 0 ppb; 30 are over 15 ppb right now and 215 have gone over at some point. Golden State Water Company - Simi Valley's 6 ppb sits at the 94th percentile in California and the 93rd nationally (higher means more lead).
Neighbouring systems
67 other systems share Ventura County; 2 of them have a higher latest lead result than Golden State Water Company - Simi Valley. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Oxnard Water Dept | 200,232 | 0 (not detected) |
| Ventura Water Department | 112,285 | 0 (not detected) |
| Ventura Wwd No. 8 - Simi Valley | 94,736 | 0 (not detected) |
| Cal American Water Co | 66,809 | 3 ppb |
| City Of Thousand Oaks Water Department | 54,770 | 0 (not detected) |
| Camarillo Water Dept | 47,701 | 0 (not detected) |
| Ventura Cwwd No. 1 - Moorpark | 35,514 | 0 (not detected) |
| Camrosa Water District | 32,700 | 0 (not detected) |
| City Of Santa Paula | 31,786 | 0 (not detected) |
| Port Hueneme City Water Dept | 21,582 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Rancho Cordova, CA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Golden State Water Company - Simi Valley whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.