Coast Springs - Cal. Water Service (Puc), CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2027). 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
Coast Springs - Cal. Water Service (Puc) serves about 445 people through 249 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Marin County, California. EPA system ID: CA2110007; 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.
Every lead result on file
That is down 1.4 ppb from 1.4 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Coast Springs - Cal. Water Service (Puc) is 4.3 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 0 (not detected) |
| 2024 | 1.4 ppb |
| 2024 | 0 (not detected) |
| 2021 | 4.3 ppb |
| 2021 | 1.7 ppb |
| 2018 | 2.13 ppb |
How Coast Springs - Cal. Water Service (Puc) 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. Coast Springs - Cal. Water Service (Puc)'s reported as 0 (not detected) sits at the 36th percentile in California and the 21st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
13 other systems share Marin County; 4 of them have a higher latest lead result than Coast Springs - Cal. Water Service (Puc). If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Marin Municipal Water District | 188,116 | 0 (not detected) |
| North Marin Water District | 61,691 | 0 (not detected) |
| Bolinas Community Pud | 1,937 | 0 (not detected) |
| North Marin Wd - Pt. Reyes | 1,841 | 0 (not detected) |
| Inverness Public Utility Dist | 1,445 | 5.3 ppb |
| Lawson S Landing | 946 | 0 (not detected) |
| Stinson Beach County Wtr Dist | 583 | 0 (not detected) |
| Muir Beach Community | 336 | 10 ppb |
| Estero Mutual | 206 | 0 (not detected) |
| Green Gulch Farm | 75 | 3 ppb |
Your move
Look up your address in Coast Springs - Cal. Water Service (Puc)'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 Coast Springs - Cal. Water Service (Puc) 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.