Knights Ferry Comm. Svc. Dist., CA
Exceeded the action level in the past
Latest 90th-percentile lead: 2.89 ppb (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.
About Knights Ferry Comm. Svc. Dist.
Knights Ferry Comm. Svc. Dist. serves about 168 people through 67 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Stanislaus County, California. EPA system ID: CA5000008; phone on file: 209-630-0879. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 6.71 ppb from 9.6 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Knights Ferry Comm. Svc. Dist. is 340 ppb across 9 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.89 ppb |
| 2025 | 9.6 ppb |
| 2025 | 5.53 ppb |
| 2024 | 0 (not detected) |
| 2024 | 340 ppb over 15 |
| 2021 | 8.2 ppb |
| 2021 | 0 (not detected) |
| 2020 | 20.2 ppb over 15 |
| 2017 | 5.15 ppb |
Against other California systems
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. Knights Ferry Comm. Svc. Dist.'s 2.89 ppb sits at the 84th percentile in California and the 80th nationally (higher means more lead).
Nearby utilities
59 other systems share Stanislaus County; 10 of them have a higher latest lead result than Knights Ferry Comm. Svc. Dist.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Modesto, City Of | 218,915 | 12 ppb |
| Turlock, City Of | 72,888 | 0.97 ppb |
| Ceres, City Of | 54,513 | 0 (not detected) |
| Riverbank, City Of | 25,625 | 21 ppb |
| Patterson, City Of | 24,977 | 0 (not detected) |
| Oakdale, City Of | 23,235 | 0 (not detected) |
| City Of Modesto - Salida | 14,576 | 0 (not detected) |
| City Of Newman-Water Department | 12,389 | 0 (not detected) |
| City Of Waterford | 8,788 | 0 (not detected) |
| Hughson, City Of | 7,977 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Knights Ferry, 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 Knights Ferry Comm. Svc. Dist. whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1400 ppb (copper action level 1,300 ppb).
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. Why an old exceedance still matters: over the limit before, under it now.