Mount St Michaels School & Church, WA
Exceeded the action level in the past
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 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 Mount St Michaels School & Church
Mount St Michaels School & Church serves about 162 people through 5 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Spokane County, Washington. EPA system ID: WA5356557. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mount St Michaels School & Church is 23.3 ppb across 3 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2018 | 23.3 ppb over 15 |
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. Mount St Michaels School & Church'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.
Nearby utilities
86 other systems share Spokane County; 54 of them have a higher latest lead result than Mount St Michaels School & Church. 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 |
Your move
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 Mount St Michaels School & Church 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. More in what a past exceedance means today.