Mcmahon Road Mutual Water Company, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 2.9 ppb (monitoring period 2022-2024). 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 Mcmahon Road Mutual Water Company
Mcmahon Road Mutual Water Company serves about 102 people through 32 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in San Benito County, California. EPA system ID: CA3500510; phone on file: 831-630-1258. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Mcmahon Road Mutual Water Company's lead record
That is up 2.9 ppb from 0 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Mcmahon Road Mutual Water Company is 2.9 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.9 ppb |
| 2021 | 0 (not detected) |
| 2018 | 2.51 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. Mcmahon Road Mutual Water Company's 2.9 ppb sits at the 84th percentile in California and the 80th nationally (higher means more lead).
Nearby utilities
30 other systems share San Benito County; 3 of them have a higher latest lead result than Mcmahon Road Mutual Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Hollister, City Of | 26,598 | 1.4 ppb |
| Sunnyslope County Water Dist | 25,486 | 0 (not detected) |
| Aromas Water District | 2,988 | 1.4 ppb |
| San Juan Bautista, City Of | 2,335 | 0 (not detected) |
| Mission Oaks Mobile Home Park | 550 | 0 (not detected) |
| Tres Pinos Cwd | 350 | 0 (not detected) |
| Golden State Water Co - San Juan Oaks | 260 | 0 (not detected) |
| Csa No. 31 Stonegate Ws | 230 | 0.7 ppb |
| San Justo Mutual Water Company | 166 | 0 (not detected) |
| Hollister Ranch Estates | 150 | 0 (not detected) |
Next steps for Hollister, CA
Test your own tap with a certified lab first-draw sample; Hollister, 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 Mcmahon Road Mutual Water Company 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. Systems that went over once often dip back under; here is what that means.