Riverdale Park Tract Csd, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 5 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.
Who runs the water here
Riverdale Park Tract Csd serves about 610 people through 180 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Stanislaus County, California. EPA system ID: CA5000019; phone on file: 209-324-2331. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 5 ppb from 0 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Riverdale Park Tract Csd is 5 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 5 ppb |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
Where this result ranks
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. Riverdale Park Tract Csd's 5 ppb sits at the 92nd percentile in California and the 91st nationally (higher means more lead).
Neighbouring systems
59 other systems share Stanislaus County; 5 of them have a higher latest lead result than Riverdale Park Tract Csd. 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) |
Your move
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 Riverdale Park Tract Csd 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.