Trentwood Irrigation District 3, WA
Exceeded the action level in the past
Latest 90th-percentile lead: 2.5 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Trentwood Irrigation District 3
Trentwood Irrigation District 3 serves about 4,228 people through 2,378 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Spokane County, Washington. EPA system ID: WA5389250. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 1.1 ppb from 1.4 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Trentwood Irrigation District 3 is 27 ppb across 4 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 2.5 ppb |
| 2020 | 1.4 ppb |
| 2019 | 1.7 ppb |
| 2017 | 27 ppb over 15 |
How Trentwood Irrigation District 3 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. Trentwood Irrigation District 3's 2.5 ppb sits at the 77th percentile in Washington and the 78th nationally (higher means more lead).
Neighbouring systems
86 other systems share Spokane County; 13 of them have a higher latest lead result than Trentwood Irrigation District 3. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Spokane City Of | 346,138 | 2 ppb |
| Whitworth Water District 2 | 26,883 | 1.3 ppb |
| Vera Water & Power | 24,692 | 20.8 ppb |
| Consolidated Irrig Dist 19 System 2 | 21,220 | 1.3 ppb |
| Spo Co Water Dist 3 Sys 1 | 19,035 | 1.6 ppb |
| Modern Electric Water Co | 18,487 | 0 (not detected) |
| Eastern Washington University | 17,108 | 6.5 ppb |
| Cheney City Of | 16,954 | 1.3 ppb |
| Liberty Lake Sewer & Water District | 14,500 | 1.5 ppb |
| Fairchild Air Force Base | 9,544 | 4.2 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Spokane, 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 Trentwood Irrigation District 3 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. Why an old exceedance still matters: over the limit before, under it now.