Nps-Ash Mountain, CA
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Nps-Ash Mountain at a glance
Nps-Ash Mountain serves about 2,930 people through 45 service connections, which makes it a small system under EPA's size classes. It is federally owned and draws surface water, in Tulare County, California. EPA system ID: CA5410513; phone on file: 559-565-3749. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Nps-Ash Mountain's lead record
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Nps-Ash Mountain is 18.6 ppb across 7 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 18.6 ppb over 15 |
| 2018 | 8 ppb |
| 2017 | 1 ppb |
How Nps-Ash Mountain 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. Nps-Ash Mountain's reported as 0 (not detected) sits at the 47th percentile in California and the 33rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
90 other systems share Tulare County; 16 of them have a higher latest lead result than Nps-Ash Mountain. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cws - Visalia | 153,522 | 0 (not detected) |
| Tulare, City Of | 72,241 | 0 (not detected) |
| Porterville, City Of | 63,487 | 0 (not detected) |
| Dinuba, City Of | 27,641 | 0 (not detected) |
| Lindsay, City Of | 12,659 | 0 (not detected) |
| Exeter, City Of | 11,169 | 11 ppb |
| Farmersville, City Of | 10,243 | 1.3 ppb |
| Orosi Public Utility District | 8,300 | 0 (not detected) |
| Woodlake, City Of | 7,918 | 0 (not detected) |
| Earlimart Pud | 7,679 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Three Rivers, 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 Nps-Ash Mountain 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. Why an old exceedance still matters: over the limit before, under it now.