Presidio Of San Francisco, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Presidio Of San Francisco at a glance
Presidio Of San Francisco serves about 3,500 people through 1,228 service connections, which makes it a medium-sized system under EPA's size classes. It is federally owned and draws surface water, in San Francisco County, California. EPA system ID: CA3810700; phone on file: 415-561-4134. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Presidio Of San Francisco is 3.05 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 3.05 ppb |
| 2016 | 2 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. Presidio Of San Francisco's reported as 0 (not detected) sits at the 48th percentile in California and the 33rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
4 other systems share San Francisco County; 1 of them has a higher latest lead result than Presidio Of San Francisco. 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 |
| San Francisco Regional Water System | 600 | 0 (not detected) |
| Hhw&P Moccasin Compound-Sfpuc | 410 | 0 (not detected) |
Next steps for San Francisco, CA
Look up your address in Presidio Of San Francisco'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 Presidio Of San Francisco 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. Small systems behave differently: why small systems go over more often.