Aurora City Of, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.7 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.
Aurora City Of at a glance
Aurora City Of serves about 533,407 people through 91,821 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Arapahoe County, Colorado. EPA system ID: CO0103005; phone on file: 303-739-7544. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 2.2 ppb from 2.5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Aurora City Of is 4.7 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 4.7 ppb |
| 2025 | 2.5 ppb |
| 2021 | 1.3 ppb |
| 2020 | 2.5 ppb |
| 2019 | 3.1 ppb |
| 2018 | 2.7 ppb |
| 2017 | 2.3 ppb |
| 2016 | 3.4 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. Aurora City Of's 4.7 ppb sits at the 92nd percentile in Colorado and the 90th nationally (higher means more lead).
Nearby utilities
28 other systems share Arapahoe County; 2 of them have a higher latest lead result than Aurora City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| East Cherry Creek Valley Wsd | 66,130 | 0 (not detected) |
| Englewood City Of | 59,904 | 5 ppb |
| Southgate Wsd | 55,000 | - |
| Southwest Metropolitan Wsd | 48,648 | - |
| Arapahoe Cnty Wwwa | 31,000 | 0 (not detected) |
| Platte Canyon Wsd | 19,485 | - |
| Willows Wd | 19,000 | - |
| Cherry Creek Village Wd | 9,215 | - |
| Inverness Wsd | 8,140 | 4 ppb |
| Glendale City Of | 4,400 | - |
What to do in your house
Test your own tap with a certified lab first-draw sample; Aurora, 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 Aurora City Of 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. Size matters more than most people expect: small vs large water systems.