City Of Modesto - Walnut Manor, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.3 ppb (monitoring period 2024-2026). 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.
City Of Modesto - Walnut Manor at a glance
City Of Modesto - Walnut Manor serves about 178 people through 54 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Stanislaus County, California. EPA system ID: CA5010031; phone on file: 209-342-4592. Call that number and ask whether your address has a lead, galvanized or unknown service line.
City Of Modesto - Walnut Manor's lead record
That is up 4.3 ppb from 0 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for City Of Modesto - Walnut Manor is 11 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 4.3 ppb |
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 11 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. City Of Modesto - Walnut Manor's 4.3 ppb sits at the 90th percentile in California and the 89th nationally (higher means more lead).
Other water systems in Stanislaus County
59 other systems share Stanislaus County; 6 of them have a higher latest lead result than City Of Modesto - Walnut Manor. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Modesto, City Of | 218,915 | 12 ppb |
| Turlock, City Of | 72,888 | 0.97 ppb |
| Ceres, City Of | 54,513 | 0 (not detected) |
| Riverbank, City Of | 25,625 | 21 ppb |
| Patterson, City Of | 24,977 | 0 (not detected) |
| Oakdale, City Of | 23,235 | 0 (not detected) |
| City Of Modesto - Salida | 14,576 | 0 (not detected) |
| City Of Newman-Water Department | 12,389 | 0 (not detected) |
| City Of Waterford | 8,788 | 0 (not detected) |
| Hughson, City Of | 7,977 | 0 (not detected) |
Next steps for Modesto, CA
Test your own tap with a certified lab first-draw sample; Modesto, 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 City Of Modesto - Walnut Manor 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. The action level is dropping - the 10 ppb rule from 2027.