Castlewood Mobile Home Park, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.5 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.
About Castlewood Mobile Home Park
Castlewood Mobile Home Park serves about 200 people through 88 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Yuba County, California. EPA system ID: CA5800832; phone on file: 530-635-3810. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
The highest 90th-percentile result EPA holds for Castlewood Mobile Home Park is 0.5 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.5 ppb |
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. Castlewood Mobile Home Park's 0.5 ppb sits at the 64th percentile in California and the 43rd nationally (higher means more lead).
Other water systems in Yuba County
20 other systems share Yuba County; 12 of them have a higher latest lead result than Castlewood Mobile Home Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Linda County Water District | 21,654 | 1.69 ppb |
| Olivehurst Public Utility District | 16,595 | 0 (not detected) |
| Cal-Water Service Co.-Marysville | 12,888 | 0 (not detected) |
| Plumas Lake | 11,374 | 0 (not detected) |
| City Of Wheatland | 4,124 | 0.63 ppb |
| North Yuba Water District | 2,772 | 2.43 ppb |
| Beale Air Force Base | 2,000 | 0 (not detected) |
| River Highlands Csd | 200 | 0 (not detected) |
| Countryside Mobile Home Park | 185 | 2.5 ppb |
| Camptonville Community Serv Dist | 180 | 10 ppb |
Next steps for Marysville, CA
Test your own tap with a certified lab first-draw sample; Marysville, 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 Castlewood Mobile Home Park 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. The action level is dropping - the 10 ppb rule from 2027.