Sonoma County Csa 41-Freestone, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 6 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.
Who runs the water here
Sonoma County Csa 41-Freestone serves about 90 people through 26 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: CA4900549; phone on file: 707-565-3580. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 6 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Sonoma County Csa 41-Freestone is 6 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 6 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Sonoma County Csa 41-Freestone 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-Freestone's 6 ppb sits at the 94th percentile in California and the 93rd nationally (higher means more lead).
Nearby utilities
128 other systems share Sonoma County; 3 of them have a higher latest lead result than Sonoma County Csa 41-Freestone. 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-Freestone 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.