Los Angeles Cwwd 40 Reg 4 & 34 Lancaster, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.8 ppb (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. 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
Los Angeles Cwwd 40 Reg 4 & 34 Lancaster serves about 208,129 people through 53,126 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 Los Angeles County, California. EPA system ID: CA1910070; phone on file: 626-300-3300. They can tell you what your service line is made of and whether they pay to replace it.
Los Angeles Cwwd 40 Reg 4 & 34 Lancaster's lead record
That is up 1.8 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Los Angeles Cwwd 40 Reg 4 & 34 Lancaster is 1.8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.8 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Los Angeles Cwwd 40 Reg 4 & 34 Lancaster 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. Los Angeles Cwwd 40 Reg 4 & 34 Lancaster's 1.8 ppb sits at the 77th percentile in California and the 68th nationally (higher means more lead).
Other water systems in Los Angeles County
197 other systems share Los Angeles County; 20 of them have a higher latest lead result than Los Angeles Cwwd 40 Reg 4 & 34 Lancaster. 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) |
| 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 |
| California Water Service Co. - Dominguez | 149,490 | 1.8 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Alhambra, 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 Los Angeles Cwwd 40 Reg 4 & 34 Lancaster 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. Size matters more than most people expect: small vs large water systems.