River Ranch Mhp, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.8 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.
River Ranch Mhp at a glance
River Ranch Mhp serves about 176 people through 138 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: CA3600155; phone on file: 760-245-9831. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2024 (2.6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for River Ranch Mhp is 5.5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.8 ppb |
| 2024 | 2.6 ppb |
| 2021 | 0 (not detected) |
| 2019 | 5.5 ppb |
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. River Ranch Mhp's 2.8 ppb sits at the 84th percentile in California and the 80th nationally (higher means more lead).
Neighbouring systems
146 other systems share San Bernardino County; 18 of them have a higher latest lead result than River Ranch Mhp. 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 Victorville, CA
Test your own tap with a certified lab first-draw sample; Victorville, 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 River Ranch Mhp whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1745 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.