Onaway Water And Sewer Assn, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (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. 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.
Onaway Water And Sewer Assn at a glance
Onaway Water And Sewer Assn serves about 200 people through 100 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Latah County, Idaho. EPA system ID: ID2290026; phone on file: 208-596-6843. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Onaway Water And Sewer Assn's lead record
That is up 2 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Onaway Water And Sewer Assn is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 1 ppb |
Where this result ranks
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. Onaway Water And Sewer Assn's 2 ppb sits at the 66th percentile in Idaho and the 70th nationally (higher means more lead).
Neighbouring systems
15 other systems share Latah County; 8 of them have a higher latest lead result than Onaway Water And Sewer Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Moscow Water Dept | 26,000 | 4 ppb |
| University Of Idaho | 8,589 | 5 ppb |
| Genesee City Of | 1,044 | 2.94 ppb |
| Troy City Of | 850 | 5 ppb |
| Potlatch City Of | 812 | 0 (not detected) |
| Juliaetta City Of | 624 | 9.9 ppb |
| Deary City Of | 529 | 0 (not detected) |
| Kendrick City Of | 313 | 1 ppb |
| North Tomer Butte W&S District | 259 | 1.21 ppb |
| Bovill Water Dept | 256 | 5.01 ppb |
Next steps for Potlatch, ID
Test your own tap with a certified lab first-draw sample; Potlatch, ID 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 Onaway Water And Sewer 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.