Castle Park Mhp, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 4 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 Castle Park Mhp
Castle Park Mhp serves about 191 people through 75 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Douglas County, Colorado. EPA system ID: CO0118167; phone on file: 303-772-0911. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 6 ppb from 10 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Castle Park Mhp is 10 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 4 ppb |
| 2025 | 10 ppb |
| 2025 | 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. Castle Park Mhp's 4 ppb sits at the 89th percentile in Colorado and the 87th nationally (higher means more lead).
Other water systems in Douglas County
29 other systems share Douglas County; 3 of them have a higher latest lead result than Castle Park Mhp. 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) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Loveland, 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 Castle Park Mhp 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. Size matters more than most people expect: small vs large water systems.