St Marys Glacier Wsd, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 3 ppb (monitoring period 2026-2026). 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
St Marys Glacier Wsd serves about 451 people through 292 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Clear Creek County, Colorado. EPA system ID: CO0110040; phone on file: 720-201-6420. Call that number and ask whether your address has a lead, galvanized or unknown service line.
St Marys Glacier Wsd's lead record
Against the period ending 2025 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for St Marys Glacier Wsd is 7 ppb across 20 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3 ppb |
| 2025 | 2 ppb |
| 2025 | 2 ppb |
| 2024 | 4 ppb |
| 2024 | 1 ppb |
| 2023 | 3 ppb |
| 2023 | 3 ppb |
| 2022 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 5 ppb |
| 2021 | 5 ppb |
| 2020 | 4 ppb |
| 2020 | 7 ppb |
| 2019 | 6 ppb |
| 2019 | 5 ppb |
| 2018 | 3 ppb |
| 2017 | 1 ppb |
| 2017 | 4.7 ppb |
| 2016 | 4 ppb |
| 2016 | 6 ppb |
Where this result ranks
Of the 1,025 Colorado systems with a lead result, the median latest reading is 1 ppb; 2 are over 15 ppb right now and 71 have gone over at some point. St Marys Glacier Wsd's 3 ppb sits at the 83rd percentile in Colorado and the 82nd nationally (higher means more lead).
Neighbouring systems
10 other systems share Clear Creek County; 4 of them have a higher latest lead result than St Marys Glacier Wsd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Idaho Springs City Of | 10,432 | 7 ppb |
| Georgetown Town Of | 5,315 | 6 ppb |
| Lookout Mountain Wd | 1,378 | 1 ppb |
| Empire Town Of | 500 | 2 ppb |
| Silver Plume Town Of | 180 | 4.5 ppb |
| Excell Lawson Village | 90 | 0 (not detected) |
| Western Inn Mhp | 72 | 0.5 ppb |
| Mill Creek Wia | 67 | 3.9 ppb |
| Valli Hi Mhp | 50 | 2 ppb |
| Arapahoe Mhp | 27 | 2.5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Wheat Ridge, CO 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 St Marys Glacier Wsd whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 3140 ppb (copper action level 1,300 ppb).
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. Size matters more than most people expect: small vs large water systems.