Zonneveld Dairy - Cerini, CA
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Zonneveld Dairy - Cerini
Zonneveld Dairy - Cerini serves about 36 people through 14 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Fresno County, California. EPA system ID: CA1000627; phone on file: 559-707-4130. 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 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Zonneveld Dairy - Cerini is 18 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 18 ppb over 15 |
| 2021 | 0 (not detected) |
| 2018 | 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. Zonneveld Dairy - Cerini's reported as 0 (not detected) sits at the 4th percentile in California and the 1st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Fresno County
99 other systems share Fresno County; 30 of them have a higher latest lead result than Zonneveld Dairy - Cerini. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Fresno | 545,970 | 0 (not detected) |
| City Of Clovis | 133,118 | 0 (not detected) |
| City Of Sanger | 26,357 | 0 (not detected) |
| Reedley, City Of | 26,076 | 0 (not detected) |
| Cws - Selma | 25,651 | 0 (not detected) |
| Bakman Water Company | 17,393 | 0 (not detected) |
| Coalinga-City | 17,277 | 0 (not detected) |
| Kerman, City Of | 17,256 | 0 (not detected) |
| Pinedale County Water District | 16,736 | 2.9 ppb |
| City Of Parlier | 14,576 | 0 (not detected) |
Next steps for Laton, CA
Test your own tap with a certified lab first-draw sample; Laton, 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 Zonneveld Dairy - Cerini 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. Why an old exceedance still matters: over the limit before, under it now.