Cal Am - Dunnigan, 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.
Cal Am - Dunnigan at a glance
Cal Am - Dunnigan serves about 602 people through 184 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Yolo County, California. EPA system ID: CA5700712; phone on file: 916-568-4259. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cal Am - Dunnigan is 0 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 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Cal Am - Dunnigan 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. Cal Am - Dunnigan's reported as 0 (not detected) sits at the 38th percentile in California and the 23rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
15 other systems share Yolo County; 0 of them have a higher latest lead result than Cal Am - Dunnigan. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Davis | 67,826 | 0 (not detected) |
| City Of Woodland | 61,462 | 0 (not detected) |
| City Of West Sacramento | 55,991 | 0 (not detected) |
| Uc - Davis | 13,177 | 0 (not detected) |
| City Of Winters | 7,115 | 0 (not detected) |
| Esparto C.S.D. | 3,572 | 0 (not detected) |
| Wild Wings Golf Community | 1,115 | 0 (not detected) |
| Knights Landing Svc. Dist. | 1,099 | 0 (not detected) |
| Madison Service Dist | 876 | 0 (not detected) |
| Yolo Co Housing Authority-El Rio Villa | 432 | 0 (not detected) |
Your move
Look up your address in Cal Am - Dunnigan'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 Am - Dunnigan 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. A zero today does not rule out a jump later - the rules are tightening in 2027.