San Francisco Regional Water System, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
San Francisco Regional Water System at a glance
San Francisco Regional Water System serves about 600 people through 256 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in San Francisco County, California. EPA system ID: CA3810001; phone on file: 650-652-3100. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 6 ppb from 6 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for San Francisco Regional Water System is 6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 6 ppb |
| 2021 | 6 ppb |
| 2018 | 0 (not detected) |
How San Francisco Regional Water System 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 Francisco Regional Water System's reported as 0 (not detected) sits at the 38th percentile in California and the 23rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in San Francisco County
4 other systems share San Francisco County; 1 of them has a higher latest lead result than San Francisco Regional Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sfpuc City Distribution Division | 848,019 | 0 (not detected) |
| Treasure Island | 3,864 | 100 ppb |
| Presidio Of San Francisco | 3,500 | 0 (not detected) |
| Hhw&P Moccasin Compound-Sfpuc | 410 | 0 (not detected) |
Next steps for Burlingame, CA
Look up your address in San Francisco Regional Water System's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask San Francisco Regional Water System 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Small systems behave differently: why small systems go over more often.