Alderdale Water Assn, WA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). 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.
About Alderdale Water Assn
Alderdale Water Assn serves about 171 people through 57 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Klickitat County, Washington. EPA system ID: WA5326214. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2024 (0.9 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Alderdale Water Assn is 6.5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0.9 ppb |
| 2020 | 6.5 ppb |
| 2017 | 6 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. Alderdale 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.
Other water systems in Klickitat County
22 other systems share Klickitat County; 14 of them have a higher latest lead result than Alderdale Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Goldendale City Of | 4,314 | 1.8 ppb |
| White Salmon City Of | 4,077 | 5.3 ppb |
| Bingen Water Dept | 1,758 | 0 (not detected) |
| Glacier Springs Water Assn | 992 | 4.2 ppb |
| Lyle Water System | 938 | 1 ppb |
| Glenwood Water System | 629 | 1 ppb |
| Wishram Water System | 599 | 1 ppb |
| Dallesport Water District | 598 | 0 (not detected) |
| Klickitat Water System | 551 | 6 ppb |
| Ponderosa Park Water System | 381 | 0 (not detected) |
Your move
Look up your address in Alderdale 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 Alderdale 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. A zero today does not rule out a jump later - the rules are tightening in 2027.