Willow Park Marina, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 ppb (monitoring period 2020-2022). 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 Willow Park Marina
Willow Park Marina serves about 380 people through 166 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 groundwater, in Contra Costa County, California. EPA system ID: CA0707507; phone on file: 925-625-3798. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 3.7 ppb from 5 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for Willow Park Marina is 5 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2022 | 1.3 ppb |
| 2019 | 5 ppb |
| 2017 | 4 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. Willow Park Marina's 1.3 ppb sits at the 73rd percentile in California and the 60th nationally (higher means more lead).
Neighbouring systems
38 other systems share Contra Costa County; 6 of them have a higher latest lead result than Willow Park Marina. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Contra Costa Water District | 210,500 | 0 (not detected) |
| City Of Antioch | 116,781 | 0 (not detected) |
| Brentwood | 64,513 | 0 (not detected) |
| City Of Pittsburg | 62,500 | 0 (not detected) |
| Diablo Water District | 47,158 | 1.9 ppb |
| City Of Martinez | 31,015 | 0 (not detected) |
| Golden State Water Company - Bay Point | 23,765 | 0.49 ppb |
| Town Of Discovery Bay | 16,790 | 0 (not detected) |
| Pleasantimes Mutual Water Co | 644 | 0.5 ppb |
| Clayton Palms Water | 549 | - |
Your move
Test your own tap with a certified lab first-draw sample; Oakley, 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 Willow Park Marina 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.