Cow Creek Water Assn, ID
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Cow Creek Water Assn serves about 28 people through 12 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Boundary County, Idaho. EPA system ID: ID1110007; phone on file: 208-267-1820. They can tell you what your service line is made of and whether they pay to replace it.
Cow Creek Water Assn's lead record
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cow Creek Water Assn is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 1 ppb |
| 2019 | 0 (not detected) |
| 2016 | 3 ppb |
Against other Idaho systems
Of the 763 Idaho systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 46 have gone over at some point. Cow Creek Water Assn's reported as 0 (not detected) sits at the 1st percentile in Idaho and the 1st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
13 other systems share Boundary County; 11 of them have a higher latest lead result than Cow Creek Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bonners Ferry City Of | 3,367 | 0 (not detected) |
| Three Mile Water Dist | 2,652 | 11 ppb |
| Cabinet Mountains Water Dist | 2,335 | 1 ppb |
| Moyie Springs City Of | 1,123 | 2 ppb |
| Bee Line Water Assn Inc | 533 | 2 ppb |
| Mission Creek Water Assn | 263 | 1 ppb |
| Paradise Valley Water Assn | 250 | 2 ppb |
| Twenty Mile Creek Water Assn | 225 | 5 ppb |
| Skin Creek Water Assn | 200 | 4 ppb |
| Trow Creek Water Assn | 98 | 1 ppb |
Your move
Look up your address in Cow Creek Water Assn's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cow Creek Water Assn 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. Small systems behave differently: why small systems go over more often.