Humboldt C.S.D., CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.05 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.
Humboldt C.S.D. at a glance
Humboldt C.S.D. serves about 19,775 people through 7,996 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 groundwater, in Humboldt County, California. EPA system ID: CA1210009; phone on file: 707-499-7974. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 1.09 ppb from 3.14 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Humboldt C.S.D. is 4 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.05 ppb |
| 2022 | 3.14 ppb |
| 2019 | 4 ppb |
| 2016 | 3.3 ppb |
How Humboldt C.S.D. 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. Humboldt C.S.D.'s 2.05 ppb sits at the 79th percentile in California and the 73rd nationally (higher means more lead).
Neighbouring systems
43 other systems share Humboldt County; 18 of them have a higher latest lead result than Humboldt C.S.D.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Eureka, City Of | 27,078 | 2.3 ppb |
| Arcata, City Of | 18,857 | 2.54 ppb |
| Mckinleyville C.S.D. | 16,900 | 1.78 ppb |
| Fortuna, City Of | 12,133 | 1.8 ppb |
| Rio Dell, City Of | 3,300 | 0 (not detected) |
| Garberville Sanitary District | 2,041 | 0 (not detected) |
| Fieldbrook Glendale C.S.D. | 1,845 | 0 (not detected) |
| Willow Creek C.S.D. | 1,720 | 0 (not detected) |
| Del Oro Water Co-Ferndale | 1,662 | 3.5 ppb |
| Hydesville Co. W.D. | 1,389 | 3.36 ppb |
Next steps for Cutten, CA
Test your own tap with a certified lab first-draw sample; Cutten, 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 Humboldt C.S.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.