Irvine Ranch Water District, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 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.
About Irvine Ranch Water District
Irvine Ranch Water District serves about 450,323 people through 121,193 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Orange County, California. EPA system ID: CA3010092; phone on file: 949-453-5344. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Irvine Ranch Water District is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Irvine Ranch Water District 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. Irvine Ranch Water District's reported as 0 (not detected) sits at the 63rd percentile in California and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
39 other systems share Orange County; 12 of them have a higher latest lead result than Irvine Ranch Water District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Anaheim | 350,254 | 0 (not detected) |
| City Of Santa Ana | 316,184 | 0 (not detected) |
| City Of Huntington Beach | 201,000 | 0 (not detected) |
| City Of Garden Grove | 174,226 | 0 (not detected) |
| Moulton Niguel Water District | 168,315 | 0 (not detected) |
| Santa Margarita Water District | 165,275 | 0 (not detected) |
| City Of Fullerton | 140,054 | 1.5 ppb |
| City Of Orange | 120,770 | 2.33 ppb |
| Golden State Wc - West Orange County | 114,693 | 2.2 ppb |
| Mesa Water District | 110,000 | 0 (not detected) |
What to do in your house
Look up your address in Irvine Ranch Water District'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 Irvine Ranch Water District 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. Small systems behave differently: why small systems go over more often.