Sierra Vista Hoa, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 3.5 ppb (monitoring period 2025-2025). 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 Sierra Vista Hoa
Sierra Vista Hoa serves about 120 people through 49 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Douglas County, Colorado. EPA system ID: CO0118065; phone on file: 720-201-6420. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Sierra Vista Hoa's lead record
That is up 2 ppb from 1.5 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Sierra Vista Hoa is 5.6 ppb across 14 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.5 ppb |
| 2024 | 1.5 ppb |
| 2023 | 2.5 ppb |
| 2022 | 0 (not detected) |
| 2021 | 2 ppb |
| 2020 | 3 ppb |
| 2020 | 1 ppb |
| 2019 | 4 ppb |
| 2019 | 1 ppb |
| 2018 | 1 ppb |
| 2018 | 3 ppb |
| 2017 | 1 ppb |
| 2017 | 5.6 ppb |
| 2016 | 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. Sierra Vista Hoa's 3.5 ppb sits at the 86th percentile in Colorado and the 85th nationally (higher means more lead).
Nearby utilities
29 other systems share Douglas County; 4 of them have a higher latest lead result than Sierra Vista Hoa. 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 Wheat Ridge, CO
Test your own tap with a certified lab first-draw sample; Wheat Ridge, 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 Sierra Vista Hoa 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.