Brewster Flat Domestic Water Assn, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 3.6 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.
Brewster Flat Domestic Water Assn at a glance
Brewster Flat Domestic Water Assn serves about 542 people through 188 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Okanogan County, Washington. EPA system ID: WA5308290. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 1.9 ppb from 1.7 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Brewster Flat Domestic Water Assn is 3.6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.6 ppb |
| 2022 | 1.7 ppb |
| 2019 | 2 ppb |
| 2016 | 0.8 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. Brewster Flat Domestic Water Assn's 3.6 ppb sits at the 86th percentile in Washington and the 86th nationally (higher means more lead).
Nearby utilities
42 other systems share Okanogan County; 1 of them has a higher latest lead result than Brewster Flat Domestic Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Omak City Of | 4,940 | 3 ppb |
| Brewster City Of | 3,843 | 1.7 ppb |
| Okanogan Water Department City Of | 3,817 | 1.4 ppb |
| Oroville City Of | 3,256 | 3.2 ppb |
| Tonasket Water System | 2,398 | 0 (not detected) |
| Coulee Dam Water Dept | 1,454 | 1.7 ppb |
| Winthrop Town Of | 1,350 | 1 ppb |
| Twisp Town Of | 1,173 | 1.1 ppb |
| Monse-Riggan Camp | 1,165 | 0 (not detected) |
| Pateros Water Department | 1,149 | 2.8 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Brewster, WA 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 Brewster Flat Domestic 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.