San Simeon Csd, CA
Above the federal action level
Latest 90th-percentile lead: 45 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. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
San Simeon Csd at a glance
San Simeon Csd serves about 462 people through 206 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 San Luis Obispo County, California. EPA system ID: CA4000568; phone on file: 805-927-4778. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 34 ppb from 11 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for San Simeon Csd is 45 ppb across 4 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 45 ppb over 15 |
| 2022 | 11 ppb over 10 |
| 2019 | 10.1 ppb over 10 |
| 2016 | 0 (not detected) |
How San Simeon Csd compares
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. San Simeon Csd's 45 ppb sits at the 100th percentile in California and the 100th nationally (higher means more lead).
Neighbouring systems
71 other systems share San Luis Obispo County; 0 of them have a higher latest lead result than San Simeon Csd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| San Luis Obispo Water Department | 49,534 | 0 (not detected) |
| Atascadero Mutual Water Co | 33,307 | 0 (not detected) |
| City Of Paso Robles Water Division | 31,176 | 0 (not detected) |
| City Of Arroyo Grande Utilities Division | 17,963 | 0 (not detected) |
| California Mens Colony | 15,000 | 0 (not detected) |
| Nipomo Comm Services Dist | 13,771 | 0 (not detected) |
| City Of Grover Beach Public Works Dept | 12,701 | 0 (not detected) |
| Morro Bay Pw Dept - Water Division | 10,757 | 0 (not detected) |
| Templeton Csd | 8,041 | 0 (not detected) |
| Pismo Beach Water Department | 7,944 | 0 (not detected) |
What to do in your house
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask San Simeon 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.