Aston Estates, WA
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.
Aston Estates at a glance
Aston Estates serves about 141 people through 59 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Okanogan County, Washington. EPA system ID: WA5309066. Ask the utility on your bill for your address in their service line inventory.
Aston Estates's lead record
That is down 1.3 ppb from 1.3 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Aston Estates is 1.3 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 1.3 ppb |
| 2018 | 0.6 ppb |
How Aston Estates compares
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. Aston Estates's reported as 0 (not detected) sits at the 18th percentile in Washington and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
42 other systems share Okanogan County; 23 of them have a higher latest lead result than Aston Estates. 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 |
Your move
Look up your address in Aston Estates'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 Aston Estates 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. Small systems behave differently: why small systems go over more often.