Mt. Pleasant Water Users Association, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.7 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.
Who runs the water here
Mt. Pleasant Water Users Association serves about 300 people through 90 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Santa Clara County, California. EPA system ID: CA4300563; phone on file: 408-472-9372. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2021 (0.2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mt. Pleasant Water Users Association is 13 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0.7 ppb |
| 2021 | 0.2 ppb |
| 2019 | 0 (not detected) |
| 2016 | 13 ppb over 10 |
How Mt. Pleasant Water Users Association 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. Mt. Pleasant Water Users Association's 0.7 ppb sits at the 67th percentile in California and the 46th nationally (higher means more lead).
Other water systems in Santa Clara County
72 other systems share Santa Clara County; 23 of them have a higher latest lead result than Mt. Pleasant Water Users Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| San Jose Water | 1,039,920 | 0 (not detected) |
| City Of Sunnyvale | 157,566 | 0 (not detected) |
| City Of Santa Clara | 134,587 | 2.7 ppb |
| Great Oaks Wc Inc | 112,582 | 0 (not detected) |
| City Of San Jose - Evg/Edv/Coy | 99,783 | 0 (not detected) |
| City Of Milpitas | 81,915 | 2.5 ppb |
| City Of Mountain View | 81,340 | 0 (not detected) |
| City Of Palo Alto | 67,658 | 0 (not detected) |
| Cwsc Los Altos Suburban | 63,559 | 1.5 ppb |
| City Of Gilroy | 59,426 | 2 ppb |
Next steps for San Jose, CA
Test your own tap with a certified lab first-draw sample; San Jose, 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 Mt. Pleasant Water Users Association 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.