Sonoma County Csa 41-Jenner, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.7 ppb (monitoring period 2023-2025). 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.
Sonoma County Csa 41-Jenner at a glance
Sonoma County Csa 41-Jenner serves about 406 people through 123 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Sonoma County, California. EPA system ID: CA4900532; phone on file: 707-565-3580. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Sonoma County Csa 41-Jenner's lead record
Against the period ending 2022 (3.1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sonoma County Csa 41-Jenner is 3.1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.7 ppb |
| 2022 | 3.1 ppb |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Sonoma County Csa 41-Jenner compares
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. Sonoma County Csa 41-Jenner's 2.7 ppb sits at the 83rd percentile in California and the 79th nationally (higher means more lead).
Other water systems in Sonoma County
128 other systems share Sonoma County; 17 of them have a higher latest lead result than Sonoma County Csa 41-Jenner. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Santa Rosa, City Of | 178,452 | 1.32 ppb |
| Petaluma, City Of | 61,427 | 0 (not detected) |
| Rohnert Park, City Of | 43,821 | 0 (not detected) |
| Windsor, Town Of | 25,561 | 0 (not detected) |
| Valley Of The Moon Water District | 23,140 | 0 (not detected) |
| Healdsburg, City Of | 10,972 | 0 (not detected) |
| Sonoma, City Of | 10,619 | 0 (not detected) |
| Cloverdale, City Of | 8,710 | 0 (not detected) |
| California-American Larkfield (Puc) | 7,911 | 6 ppb |
| Sebastopol, City Of | 7,522 | 0 (not detected) |
Next steps for Santa Rosa, CA
Test your own tap with a certified lab first-draw sample; Santa Rosa, 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 Sonoma County Csa 41-Jenner 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.