Idledale 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.
About Idledale Wsd
Idledale Wsd serves about 350 people through 137 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 Jefferson County, Colorado. EPA system ID: CO0130055; phone on file: 720-213-6621. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 3 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Idledale Wsd is 9 ppb across 16 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3 ppb |
| 2025 | 0 (not detected) |
| 2025 | 2 ppb |
| 2024 | 9 ppb |
| 2024 | 1 ppb |
| 2023 | 1 ppb |
| 2022 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 3 ppb |
| 2021 | 2 ppb |
| 2020 | 4 ppb |
| 2020 | 4 ppb |
| 2019 | 7 ppb |
| 2019 | 2 ppb |
| 2018 | 1 ppb |
| 2017 | 7.4 ppb |
How Idledale Wsd compares
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. Idledale Wsd's 3 ppb sits at the 83rd percentile in Colorado and the 82nd nationally (higher means more lead).
Other water systems in Jefferson County
50 other systems share Jefferson County; 9 of them have a higher latest lead result than Idledale Wsd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Arvada City Of | 171,610 | 3.1 ppb |
| Consolidated Mutual Maple Grove | 81,400 | 3.7 ppb |
| Green Mountain Wsd | 49,400 | - |
| Bancroft Clover Wsd | 44,000 | - |
| Golden City Of | 38,288 | 0 (not detected) |
| Bear Creek Wsd | 30,000 | - |
| Wheat Ridge Water District | 20,000 | - |
| Evergreen Md | 15,750 | 6 ppb |
| Ken Caryl Wsd | 12,000 | - |
| Lakehurst Wsd | 12,000 | - |
Your move
Test your own tap with a certified lab first-draw sample; Denver, 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 Idledale Wsd 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.