Edwall Water Assn, WA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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 Edwall Water Assn
Edwall Water Assn serves about 170 people through 37 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lincoln County, Washington. EPA system ID: WA5322550. Ask the utility on your bill for your address in their service line inventory.
Edwall Water Assn's lead record
Against the period ending 2020 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Edwall Water Assn is 1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 1 ppb |
| 2017 | 0.7 ppb |
Where this result ranks
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. Edwall Water Assn's reported as 0 (not detected) sits at the 20th percentile in Washington and the 14th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
14 other systems share Lincoln County; 6 of them have a higher latest lead result than Edwall Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Davenport Water Division | 1,750 | 0 (not detected) |
| Reardan Town Of | 1,418 | 0 (not detected) |
| Wilbur Town Of | 1,040 | 1.2 ppb |
| Odessa | 986 | 0 (not detected) |
| Harrington City Of | 650 | 1.4 ppb |
| Sprague City Of | 570 | 0 (not detected) |
| Roosevelt Lake Ranch | 487 | 1.6 ppb |
| Seven Bays Estates Unlimited | 431 | 0 (not detected) |
| Almira Water System | 372 | 4.8 ppb |
| Creston Public Water | 348 | 1.4 ppb |
Your move
Look up your address in Edwall Water Assn'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 Edwall 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. Small systems behave differently: why small systems go over more often.