Rosecrest Mutual, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.97 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.
Rosecrest Mutual at a glance
Rosecrest Mutual serves about 31 people through 15 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Placer County, California. EPA system ID: CA3100538; phone on file: 916-782-4543. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 2.97 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Rosecrest Mutual is 2.97 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.97 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 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. Rosecrest Mutual's 2.97 ppb sits at the 85th percentile in California and the 81st nationally (higher means more lead).
Nearby utilities
50 other systems share Placer County; 14 of them have a higher latest lead result than Rosecrest Mutual. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Roseville | 165,736 | 0 (not detected) |
| Placer Cwa - Foothill | 93,417 | 0 (not detected) |
| City Of Lincoln | 56,268 | 0 (not detected) |
| Placer Cwa - Auburn/Bowman | 27,317 | 0 (not detected) |
| Cal Am - West Placer | 9,547 | 0 (not detected) |
| Nevada Id - North Auburn | 6,870 | 0 (not detected) |
| Foresthill Public Utility Dist | 6,811 | 0 (not detected) |
| Tahoe City Pud - Main | 6,411 | 4.4 ppb |
| North Tahoe Pud - Main | 6,321 | 1.45 ppb |
| Northstar Csd - Martis Valley | 4,432 | 0.85 ppb |
Next steps for Roseville, CA
Test your own tap with a certified lab first-draw sample; Roseville, 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 Rosecrest Mutual 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.