North Twin Lakeview Assn, WA
Above the federal action level
Latest 90th-percentile lead: 33.3 ppb (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
Who runs the water here
North Twin Lakeview Assn serves about 88 people through 104 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Ferry County, Washington. EPA system ID: WA5361480. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 28.9 ppb from 4.4 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for North Twin Lakeview Assn is 33.3 ppb across 3 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 33.3 ppb over 15 |
| 2020 | 4.4 ppb |
| 2017 | 5.4 ppb |
Against other Washington systems
Of the 2,218 Washington systems with a lead result, the median latest reading is 1 ppb; 18 are over 15 ppb right now and 62 have gone over at some point. North Twin Lakeview Assn's 33.3 ppb sits at the 100th percentile in Washington and the 100th nationally (higher means more lead).
Neighbouring systems
10 other systems share Ferry County; 0 of them have a higher latest lead result than North Twin Lakeview Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Republic City Of | 1,673 | 2.2 ppb |
| Inchelium Water District | 540 | 0 (not detected) |
| Curlew Conservation Center | 349 | 3.6 ppb |
| Curlew Water & Sewer District | 316 | 0.9 ppb |
| Lakeside Park | 180 | 1 ppb |
| Orient Water Company | 167 | 5 ppb |
| Curlew Kai Homeowner Water System | 133 | 1 ppb |
| Martin Creek Community Assn | 109 | 0 (not detected) |
| Riverwood Water System | 43 | 2 ppb |
| Fourth Of July Creek Estates | 29 | - |
What to do in your house
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask North Twin Lakeview 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.