Forest Knolls Mutual Water Co, 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.
Forest Knolls Mutual Water Co at a glance
Forest Knolls Mutual Water Co serves about 44 people through 21 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Butte County, California. EPA system ID: CA0400078; phone on file: 530-893-8805. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Forest Knolls Mutual Water Co's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Forest Knolls Mutual Water Co is 0 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 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Forest Knolls Mutual Water Co 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. Forest Knolls Mutual Water Co's reported as 0 (not detected) sits at the 6th percentile in California and the 2nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
41 other systems share Butte County; 14 of them have a higher latest lead result than Forest Knolls Mutual Water Co. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cal-Water Service Co.-Chico | 110,473 | 0 (not detected) |
| South Feather W&P - Miners Ranch | 22,638 | 0 (not detected) |
| Thermalito Water & Sewer Dist | 12,209 | 0 (not detected) |
| Cal-Water Service Co.-Oroville | 11,047 | 0.9 ppb |
| Del Oro Water Co.-Paradise Pines | 10,738 | 0.54 ppb |
| Paradise Irrigation District | 9,114 | 0 (not detected) |
| City Of Gridley | 7,269 | 0 (not detected) |
| City Of Biggs | 2,060 | 6.91 ppb |
| Durham Irrigation District | 1,581 | 0.74 ppb |
| Del Oro Water Co.-Lime Saddle Marina | 954 | 0 (not detected) |
What to do in your house
Look up your address in Forest Knolls Mutual Water Co'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 Forest Knolls Mutual Water Co 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. Small systems behave differently: why small systems go over more often.