California Water Service Co-Leona Valley, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 5.5 ppb (monitoring period 2025-2027). 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.
California Water Service Co-Leona Valley at a glance
California Water Service Co-Leona Valley serves about 895 people through 429 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws surface water, in Los Angeles County, California. EPA system ID: CA1910243; phone on file: 408-367-8593. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 9.2 ppb from 14.7 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for California Water Service Co-Leona Valley is 14.7 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 5.5 ppb |
| 2024 | 14.7 ppb over 10 |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
Where this result ranks
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 Co-Leona Valley's 5.5 ppb sits at the 93rd percentile in California and the 92nd nationally (higher means more lead).
Other water systems in Los Angeles County
197 other systems share Los Angeles County; 7 of them have a higher latest lead result than California Water Service Co-Leona Valley. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Los Angeles-City, Dept. Of Water & Power | 3,875,566 | 3.9 ppb |
| Long Beach Utilities Department | 466,772 | 0.97 ppb |
| Santa Clarita Valley Water Agency | 292,014 | 0 (not detected) |
| Gswc - Southwest | 277,740 | 1.7 ppb |
| San Gabriel Valley Water Co.-El Monte | 240,000 | 0 (not detected) |
| Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | 208,129 | 1.8 ppb |
| Glendale-City, Water Dept. | 192,212 | 5.3 ppb |
| Suburban Water Systems-San Jose | 170,523 | 0 (not detected) |
| Pasadena Water And Power | 165,448 | 1.9 ppb |
| Pomona - City, Water Dept. | 151,713 | 2.1 ppb |
Next steps for San Jose, CA
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 Co-Leona Valley 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Systems that went over once often dip back under; here is what that means.