North Shore Mwc, CA
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
North Shore Mwc serves about 7 people through 33 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in San Bernardino County, California. EPA system ID: CA3600184; phone on file: 949-500-6358. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
North Shore Mwc's lead record
Against the period ending 2026 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for North Shore Mwc is 27.5 ppb across 8 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 0 (not detected) |
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 12 ppb over 10 |
| 2022 | 12 ppb over 10 |
| 2021 | 19.1 ppb over 15 |
| 2018 | 3.3 ppb |
| 2017 | 27.5 ppb over 15 |
How North Shore Mwc 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. North Shore Mwc's reported as 0 (not detected) sits at the 0th percentile in California and the 0th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
146 other systems share San Bernardino County; 34 of them have a higher latest lead result than North Shore 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 Fawnskin, CA
Test your own tap with a certified lab first-draw sample; Fawnskin, 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 North Shore Mwc whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1595 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. The lead result guide covers how utilities pick the homes they sample. More in what a past exceedance means today.