Cal-Am Water Coronado, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (monitoring period 2024-2026). 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.
About Cal-Am Water Coronado
Cal-Am Water Coronado serves about 106,000 people through 21,766 service connections, which makes it a very large system under EPA's size classes. It is privately owned and draws surface water, in San Diego County, California. EPA system ID: CA3710001; phone on file: 619-446-5703. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 2 ppb from 0 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Cal-Am Water Coronado is 2 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2 ppb |
| 2024 | 0 (not detected) |
| 2021 | 1 ppb |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Cal-Am Water Coronado 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. Cal-Am Water Coronado's 2 ppb sits at the 79th percentile in California and the 73rd nationally (higher means more lead).
Neighbouring systems
80 other systems share San Diego County; 12 of them have a higher latest lead result than Cal-Am Water Coronado. 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) |
| Carlsbad Mwd | 96,371 | 0 (not detected) |
| Padre Dam Mwd | 93,980 | 1.1 ppb |
Next steps for Imperial Beach, CA
Test your own tap with a certified lab first-draw sample; Imperial Beach, 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 Cal-Am Water Coronado 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. The action level is dropping - the 10 ppb rule from 2027.