Moses Lake City Of, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 3.2 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. 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.
Who runs the water here
Moses Lake City Of serves about 32,428 people through 13,420 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Grant County, Washington. EPA system ID: WA5356300. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 1.3 ppb from 1.9 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Moses Lake City Of is 3.2 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 3.2 ppb |
| 2020 | 1.9 ppb |
| 2017 | 1.8 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. Moses Lake City Of's 3.2 ppb sits at the 83rd percentile in Washington and the 84th nationally (higher means more lead).
Other water systems in Grant County
80 other systems share Grant County; 3 of them have a higher latest lead result than Moses Lake City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ephrata Water Department | 8,718 | 0 (not detected) |
| Quincy Water Department City Of | 8,415 | 2.5 ppb |
| Mattawa City Of | 5,370 | 0 (not detected) |
| Warden City Of | 4,674 | 0 (not detected) |
| Royal City Water | 3,389 | 3 ppb |
| Desert Aire Owner Assn | 2,856 | 1 ppb |
| Soap Lake Water Dept | 2,399 | 0 (not detected) |
| Electric City City Of | 1,812 | 2.6 ppb |
| Sunland Estates Homeowners Assn | 1,480 | 0 (not detected) |
| Grand Coulee Water Dept City Of | 1,428 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Moses Lake, 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 Moses Lake City Of 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.