Green Valley Mwc, CA
Above the federal action level
Latest 90th-percentile lead: 24.9 ppb (monitoring period 2018-2020). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
Who runs the water here
Green Valley Mwc serves about 2,993 people through 1,070 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws surface water, in San Bernardino County, California. EPA system ID: CA3610023; phone on file: 909-867-2912. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 12.2 ppb from 12.7 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Green Valley Mwc is 24.9 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2020 | 24.9 ppb over 15 |
| 2020 | 12.7 ppb over 10 |
| 2019 | 14.8 ppb over 10 |
| 2019 | 7.9 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. Green Valley Mwc's 24.9 ppb sits at the 99th percentile in California and the 99th nationally (higher means more lead).
Other water systems in San Bernardino County
146 other systems share San Bernardino County; 0 of them have a higher latest lead result than Green Valley Mwc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| San Gabriel Valley Wc - Fontana | 228,270 | 0 (not detected) |
| San Bernardino City | 214,665 | 0 (not detected) |
| Cucamonga Valley Water District | 213,375 | 0 (not detected) |
| Ontario Municipal Utilities Company | 185,010 | 0.6 ppb |
| Victorville Water District | 140,721 | 0 (not detected) |
| San Bernardino Valley Wd | 109,608 | - |
| East Valley Water District | 108,600 | 0 (not detected) |
| Hesperia Wd | 101,836 | 0 (not detected) |
| West Valley Water District | 96,123 | 0 (not detected) |
| Chino, City Of | 90,187 | 1 ppb |
Next steps for Green Valley Lake, CA
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Green Valley Mwc whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1730 ppb (copper action level 1,300 ppb).
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.