Cascadel Mutual Water System, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 8 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.
About Cascadel Mutual Water System
Cascadel Mutual Water System serves about 50 people through 120 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Madera County, California. EPA system ID: CA2000509; phone on file: 559-877-2635. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 8 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Cascadel Mutual Water System is 8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 8 ppb |
| 2022 | 0 (not detected) |
| 2019 | 4 ppb |
| 2016 | 5 ppb |
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. Cascadel Mutual Water System's 8 ppb sits at the 96th percentile in California and the 96th nationally (higher means more lead).
Other water systems in Madera County
67 other systems share Madera County; 4 of them have a higher latest lead result than Cascadel Mutual Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Madera | 66,560 | 3 ppb |
| Chowchilla City Water Dept | 13,916 | 0 (not detected) |
| Riverstone/Rootcreek Water District | 10,276 | 1.2 ppb |
| Madera Valley Water Company | 6,524 | 0 (not detected) |
| Yosemite Spring Park Util Co | 5,300 | 0 (not detected) |
| Tesoro Viejo Master Mwc, Inc. | 4,660 | 0 (not detected) |
| Cal Am - Oakhurst | 3,710 | 5 ppb |
| Valley State Prison | 3,151 | 0 (not detected) |
| Madera Co Md10a-Madera Ranchos | 3,072 | 5.4 ppb |
| Cal Am - Bass Lake | 3,066 | 2 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; North Fork, 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 Cascadel Mutual Water System 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.