Roxborough Wsd, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 5 ppb (monitoring period 2023-2025). 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.
Roxborough Wsd at a glance
Roxborough Wsd serves about 13,765 people through 3,707 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: CO0118055; phone on file: 303-979-7286. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 1.1 ppb from 3.9 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Roxborough Wsd is 8.9 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2022 | 3.9 ppb |
| 2021 | 3 ppb |
| 2020 | 3 ppb |
| 2019 | 6 ppb |
| 2019 | 8.9 ppb |
| 2018 | 7.9 ppb |
| 2018 | 5 ppb |
| 2017 | 2 ppb |
| 2016 | 2 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. Roxborough Wsd's 5 ppb sits at the 93rd percentile in Colorado and the 91st nationally (higher means more lead).
Neighbouring systems
29 other systems share Douglas County; 1 of them has a higher latest lead result than Roxborough 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 |
| Parker Wsd | 75,949 | 2.6 ppb |
| Meridian Md | 23,415 | 0 (not detected) |
| Stonegate Md | 15,295 | 2 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; Littleton, 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 Roxborough 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.