San Juan Vista, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.6 ppb (monitoring period 2022-2024). 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.
About San Juan Vista
San Juan Vista serves about 201 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: CA3901215; phone on file: 209-662-9627. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
San Juan Vista's lead record
That is up 2.6 ppb from 0 ppb in the period ending 2018. The highest 90th-percentile result EPA holds for San Juan Vista is 2.6 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.6 ppb |
| 2018 | 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. San Juan Vista's 2.6 ppb sits at the 82nd percentile in California and the 78th nationally (higher means more lead).
Other water systems in San Joaquin County
92 other systems share San Joaquin County; 9 of them have a higher latest lead result than San Juan Vista. 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) |
Next steps for Stockton, CA
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 San Juan Vista 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.