Parker Wsd, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 2.6 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.
Parker Wsd at a glance
Parker Wsd serves about 75,949 people through 20,005 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 surface water, in Douglas County, Colorado. EPA system ID: CO0118040; phone on file: 303-841-2058. They can tell you what your service line is made of and whether they pay to replace it.
Parker 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 Parker Wsd is 4 ppb across 22 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.6 ppb |
| 2025 | 2 ppb |
| 2025 | 1.8 ppb |
| 2024 | 2.5 ppb |
| 2024 | 2.1 ppb |
| 2023 | 1.5 ppb |
| 2023 | 3.3 ppb |
| 2022 | 2 ppb |
| 2022 | 3.9 ppb |
| 2021 | 3.7 ppb |
| 2021 | 3.4 ppb |
| 2020 | 4 ppb |
| 2020 | 3.6 ppb |
| 2019 | 2.4 ppb |
| 2019 | 3.2 ppb |
| 2018 | 2 ppb |
| 2018 | 2.2 ppb |
| 2017 | 2 ppb |
| 2017 | 3 ppb |
| 2016 | 3 ppb |
| 2016 | 1.2 ppb |
| 2016 | 4 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. Parker Wsd's 2.6 ppb sits at the 80th percentile in Colorado and the 78th nationally (higher means more lead).
Other water systems in Douglas County
29 other systems share Douglas County; 7 of them have a higher latest lead result than Parker Wsd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Castle Rock Town Of | 110,298 | 2 ppb |
| Highlands Ranch Wsd | 103,444 | 3 ppb |
| Meridian Md | 23,415 | 0 (not detected) |
| Stonegate Md | 15,295 | 2 ppb |
| Roxborough Wsd | 13,765 | 5 ppb |
| Pinery Wwd | 12,901 | 0 (not detected) |
| Castle Pines North Md | 12,800 | 0 (not detected) |
| Sterling Ranch Cab | 11,501 | 0 (not detected) |
| Cottonwood Wsd | 10,867 | 0 (not detected) |
| Northern Douglas County Wsd | 6,160 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Parker, 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 Parker 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.