City Of Rio Vista, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2028). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
City Of Rio Vista serves about 11,206 people through 5,877 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Solano County, California. EPA system ID: CA4810004; phone on file: 707-374-6451. 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 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for City Of Rio Vista is 0.9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2028 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0.9 ppb |
How City Of Rio Vista 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. City Of Rio Vista's reported as 0 (not detected) sits at the 53rd percentile in California and the 37th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Solano County
25 other systems share Solano County; 7 of them have a higher latest lead result than City Of Rio Vista. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Vallejo | 121,420 | 0 (not detected) |
| City Of Fairfield | 120,720 | 0 (not detected) |
| City Of Vacaville | 99,650 | 0 (not detected) |
| Suisun-Solano Water Authority | 29,105 | 0 (not detected) |
| City Of Benicia | 27,131 | 2.3 ppb |
| California Water Service Co.-Travis Afb | 18,111 | 1.7 ppb |
| City Of Dixon | 12,540 | 0 (not detected) |
| California Water Service Co. - Dixon | 10,623 | 0 (not detected) |
| California State Prison - Solano | 3,882 | 0 (not detected) |
| City Of Vallejo-Lakes System | 2,800 | 0 (not detected) |
Your move
Look up your address in City Of Rio Vista's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask City Of Rio 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. The lead result guide covers how utilities pick the homes they sample. A zero today does not rule out a jump later - the rules are tightening in 2027.