Roxborough Nw Douglas County, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 5.8 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.
About Roxborough Nw Douglas County
Roxborough Nw Douglas County serves about 860 people through 184 service connections, which makes it a small 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: CO0118070; phone on file: 303-979-7286. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 5.2 ppb from 11 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Roxborough Nw Douglas County is 11 ppb across 7 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5.8 ppb |
| 2021 | 11 ppb over 10 |
| 2020 | 4 ppb |
| 2019 | 1 ppb |
| 2018 | 2 ppb |
| 2018 | 5 ppb |
| 2017 | 2 ppb |
Against other Colorado systems
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 Nw Douglas County's 5.8 ppb sits at the 94th percentile in Colorado and the 93rd nationally (higher means more lead).
Other water systems in Douglas County
29 other systems share Douglas County; 0 of them have a higher latest lead result than Roxborough Nw Douglas County. 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 |
| 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) |
Next steps for Littleton, CO
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 Nw Douglas County 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.