Santa Fe I.D., CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.7 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. 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.
Santa Fe I.D. at a glance
Santa Fe I.D. serves about 21,539 people through 6,503 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in San Diego County, California. EPA system ID: CA3710023; phone on file: 858-756-2424. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Santa Fe I.D.'s lead record
That is up 1.7 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Santa Fe I.D. is 1.7 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.7 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
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. Santa Fe I.D.'s 1.7 ppb sits at the 76th percentile in California and the 67th nationally (higher means more lead).
Neighbouring systems
80 other systems share San Diego County; 14 of them have a higher latest lead result than Santa Fe I.D.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| San Diego, City Of | 1,408,937 | 0 (not detected) |
| Helix Water District | 277,918 | 0 (not detected) |
| Otay Water District | 242,155 | 0 (not detected) |
| Sweetwater Authority | 184,915 | 0 (not detected) |
| Oceanside, City Of | 174,340 | 0 (not detected) |
| Escondido, City Of | 137,044 | 1.1 ppb |
| Vista Irrigation District | 134,501 | 0 (not detected) |
| Vallecitos Wd | 114,700 | 0 (not detected) |
| Cal-Am Water Coronado | 106,000 | 2 ppb |
| Carlsbad Mwd | 96,371 | 0 (not detected) |
Next steps for Rancho Santa Fe, CA
Test your own tap with a certified lab first-draw sample; Rancho Santa Fe, 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 Santa Fe I.D. 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. Size matters more than most people expect: small vs large water systems.