Imperial County · tap water by city
FilteredWTR tracks 9 public water systems in Imperial County, and their own population counts add up to 163,487 people. Over the last three years two of them picked up health-based violations on the EPA record: City of Calexico and City of Imperial. In the latest round of lead testing, 6 systems reported a 90th-percentile result of zero. None came in at or above 0.0075 mg/L, which is half the federal action level of 0.015 mg/L.
The largest systems come first. Lead is each system's most recent 90th-percentile result from the federal Lead and Copper Rule, and the last column counts health-based violations from the last three years. Systems sample on their own schedules, so their monitoring periods end anywhere from 2020 to 2027.
| Water system | Cities served | People served | Latest lead (90th percentile) | Recent health violations |
|---|---|---|---|---|
| City of El Centro | El Centro | 44,124 | Not detected, period ending 2024 | 0 |
| City of Calexico | Calexico | 40,357 | Not detected, period ending 2026 | 1 |
| City of Brawley | Brawley | 26,862 | Not detected, period ending 2020 | 0 |
| City of Imperial | Imperial | 22,102 | Not detected, period ending 2025 | 1 |
| GSWC - Calipatria | Calipatria | 7,475 | Not detected, period ending 2025 | 0 |
| Heber Public Utility District | Heber | 7,312 | Not detected, period ending 2025 | 0 |
| City of Holtville | Holtville | 6,355 | 0.0009 mg/L, period ending 2027 | 0 |
| Calipatria State Prison | Not listed | 4,800 | 0.0016 mg/L, period ending 2026 | 0 |
| Centinela State Prison | Not listed | 4,100 | 0.0016 mg/L, period ending 2024 | 0 |
Each report covers the water system that serves that city, with its measured results and its full EPA compliance history.
Every system has to collect tap samples from a set list of homes and report the lead level at the 90th percentile. Nine out of ten sampled homes came in at or below that figure. The federal action level is 0.015 mg/L, and a system that goes over it has to take corrective steps and tell its customers. A zero means the samples came back below what the lab can detect.
A health-based violation means the system broke a rule tied to health, such as going over a contaminant limit or missing a required treatment step. Late paperwork and skipped reports go on the EPA record too, and this page leaves those out.
These figures describe the water each system sends out, and the water at your own faucet can test differently. Lead most often enters from a home's own pipes and fixtures, so houses built before 1986 are worth a closer look. Chlorine levels also drift with how far a street sits from the treatment plant.
A local FilteredWTR tech screens the water at your faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.
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