Cal-Water Service Co.-Willows, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Cal-Water Service Co.-Willows serves about 7,107 people through 2,357 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Glenn County, California. EPA system ID: CA1110003; phone on file: 408-367-8593. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cal-Water Service Co.-Willows is 0.81 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2020 | 0.81 ppb |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
Against other California systems
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. Cal-Water Service Co.-Willows's reported as 0 (not detected) sits at the 51st percentile in California and the 36th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
11 other systems share Glenn County; 2 of them have a higher latest lead result than Cal-Water Service Co.-Willows. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Orland | 8,298 | 0 (not detected) |
| Cal-Water Service Co.-Hamilton City | 1,575 | 0 (not detected) |
| Del Oro Wc - Black Butte District | 277 | 3.05 ppb |
| Artois Community S.D. | 267 | 0 (not detected) |
| Willows Mobile Home Community & Rv Park | 227 | 0 (not detected) |
| Elk Creek Community S.D. | 184 | 0 (not detected) |
| Orland Mobile H.P. | 178 | 0 (not detected) |
| Butte City Community S.D. | 75 | 0 (not detected) |
| Palisades, The | 62 | 0 (not detected) |
| Country Leisure Mobile Estates | 40 | 0 (not detected) |
Your move
Look up your address in Cal-Water Service Co.-Willows's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cal-Water Service Co.-Willows 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Small systems behave differently: why small systems go over more often.