Del Oro Wc - Black Butte District, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 3.05 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.
Del Oro Wc - Black Butte District at a glance
Del Oro Wc - Black Butte District serves about 277 people through 84 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Glenn County, California. EPA system ID: CA1100404; phone on file: 530-809-3970. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 1.94 ppb from 1.11 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Del Oro Wc - Black Butte District is 3.05 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.05 ppb |
| 2023 | 1.11 ppb |
| 2020 | 0 (not detected) |
| 2017 | 2.94 ppb |
Against other California systems
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. Del Oro Wc - Black Butte District's 3.05 ppb sits at the 86th percentile in California and the 83rd nationally (higher means more lead).
Nearby utilities
11 other systems share Glenn County; 0 of them have a higher latest lead result than Del Oro Wc - Black Butte District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Orland | 8,298 | 0 (not detected) |
| Cal-Water Service Co.-Willows | 7,107 | 0 (not detected) |
| Cal-Water Service Co.-Hamilton City | 1,575 | 0 (not detected) |
| Artois Community S.D. | 267 | 0 (not detected) |
| Willows Mobile Home Community & Rv Park | 227 | 0 (not detected) |
| Elk Creek Community S.D. | 184 | 0 (not detected) |
| Orland Mobile H.P. | 178 | 0 (not detected) |
| Butte City Community S.D. | 75 | 0 (not detected) |
| Palisades, The | 62 | 0 (not detected) |
| Country Leisure Mobile Estates | 40 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Chico, 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 Del Oro Wc - Black Butte District 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.