California Water Service - Livermore, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 7.5 ppb (monitoring period 2022-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
California Water Service - Livermore serves about 60,414 people through 18,595 service connections, which makes it a large system under EPA's size classes. It is privately owned and draws surface water, in Alameda County, California. EPA system ID: CA0110003; phone on file: 408-367-8490. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 5.7 ppb from 1.8 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for California Water Service - Livermore is 7.5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 7.5 ppb |
| 2021 | 1.8 ppb |
| 2019 | 2.07 ppb |
| 2016 | 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. California Water Service - Livermore's 7.5 ppb sits at the 96th percentile in California and the 95th nationally (higher means more lead).
Other water systems in Alameda County
13 other systems share Alameda County; 0 of them have a higher latest lead result than California Water Service - Livermore. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| East Bay Mud | 1,468,000 | 0 (not detected) |
| Alameda County Water District | 344,000 | 0 (not detected) |
| City Of Hayward | 162,954 | 0 (not detected) |
| Dublin San Ramon Services District | 98,776 | 0 (not detected) |
| City Of Pleasanton | 76,689 | 0 (not detected) |
| City Of Livermore | 38,892 | 0 (not detected) |
| Alameda Point | 600 | 0 (not detected) |
| Castlewood Domestic Water System | 524 | 0 (not detected) |
| Trailer Haven Mobile Home Park | 459 | 2.7 ppb |
| Town Of Sunol - Sfpuc | 281 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; San Jose, 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 California Water Service - Livermore 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. Systems that went over once often dip back under; here is what that means.