Caribou Mobile Park Pws, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 9.3 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.
Caribou Mobile Park Pws at a glance
Caribou Mobile Park Pws serves about 180 people through 72 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in San Joaquin County, California. EPA system ID: CA3900568; phone on file: 209-931-3118. 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 5.7 ppb from 3.6 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Caribou Mobile Park Pws is 13 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 9.3 ppb |
| 2022 | 3.6 ppb |
| 2019 | 7 ppb |
| 2016 | 13 ppb over 10 |
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. Caribou Mobile Park Pws's 9.3 ppb sits at the 97th percentile in California and the 97th nationally (higher means more lead).
Other water systems in San Joaquin County
92 other systems share San Joaquin County; 3 of them have a higher latest lead result than Caribou Mobile Park Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Stockton | 192,702 | 0 (not detected) |
| California Water Service - Stockton | 182,775 | 0 (not detected) |
| Tracy, City Of | 98,215 | 0 (not detected) |
| Manteca, City Of | 84,928 | 0.4 ppb |
| Lodi, City Of | 67,093 | 0 (not detected) |
| City Of Lathrop | 38,596 | 0 (not detected) |
| City Of Mountain House | 26,400 | 0 (not detected) |
| Ripon, City Of | 15,753 | 0 (not detected) |
| Escalon, City Of | 7,232 | 0 (not detected) |
| San Joaquin County - Lincoln Village | 5,841 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Stockton, 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 Caribou Mobile Park Pws 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. Size matters more than most people expect: small vs large water systems.