Shamrock Mobile Home Park, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 6 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.
Shamrock Mobile Home Park at a glance
Shamrock Mobile Home Park serves about 188 people through 127 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Sonoma County, California. EPA system ID: CA4900723; phone on file: 707-318-1569. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Shamrock Mobile Home Park's lead record
That is up 6 ppb from 0 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Shamrock Mobile Home Park is 6 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 6 ppb |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
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. Shamrock Mobile Home Park's 6 ppb sits at the 94th percentile in California and the 93rd nationally (higher means more lead).
Nearby utilities
128 other systems share Sonoma County; 3 of them have a higher latest lead result than Shamrock Mobile Home Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Santa Rosa, City Of | 178,452 | 1.32 ppb |
| Petaluma, City Of | 61,427 | 0 (not detected) |
| Rohnert Park, City Of | 43,821 | 0 (not detected) |
| Windsor, Town Of | 25,561 | 0 (not detected) |
| Valley Of The Moon Water District | 23,140 | 0 (not detected) |
| Healdsburg, City Of | 10,972 | 0 (not detected) |
| Sonoma, City Of | 10,619 | 0 (not detected) |
| Cloverdale, City Of | 8,710 | 0 (not detected) |
| California-American Larkfield (Puc) | 7,911 | 6 ppb |
| Sebastopol, City Of | 7,522 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Santa Rosa, 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 Shamrock 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. Size matters more than most people expect: small vs large water systems.