Kooskia Water Dept, 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.
About Kooskia Water Dept
Kooskia Water Dept serves about 514 people through 352 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Idaho County, Idaho. EPA system ID: ID2250032; phone on file: 208-935-0319. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Kooskia Water Dept 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 | 3 ppb |
| 2016 | 0 (not detected) |
How Kooskia Water Dept compares
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. Kooskia Water Dept's reported as 0 (not detected) sits at the 30th percentile in Idaho and the 23rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Idaho County
17 other systems share Idaho County; 12 of them have a higher latest lead result than Kooskia Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Grangeville Water Dept | 3,151 | 2 ppb |
| Cottonwood Water Dept | 977 | 1 ppb |
| Riggins City Of | 434 | 2 ppb |
| Idoc North Idaho Correctional Institute | 425 | 2 ppb |
| Pine Ridge Water And Sewer Dist | 390 | 2 ppb |
| Elk City Water And Sewer Assn | 320 | 9 ppb |
| Stites City Of | 253 | 1 ppb |
| Kamiah Valley Company Llc | 250 | 0 (not detected) |
| Monastery Of St Gertrudes | 200 | 0 (not detected) |
| Ferdinand City Of | 133 | 2.84 ppb |
What to do in your house
Look up your address in Kooskia Water Dept'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 Kooskia Water Dept 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.