Northern Colorado Wa, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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 Northern Colorado Wa
Northern Colorado Wa serves about 4,675 people through 1,504 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws surface water, in Larimer County, Colorado. EPA system ID: CO0135554; phone on file: 970-566-1003. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2025 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Northern Colorado Wa is 4 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2025 | 2 ppb |
| 2024 | 1 ppb |
| 2022 | 1 ppb |
| 2021 | 4 ppb |
| 2020 | 3 ppb |
| 2019 | 3 ppb |
| 2018 | 2 ppb |
| 2017 | 2 ppb |
| 2016 | 1 ppb |
How Northern Colorado Wa compares
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. Northern Colorado Wa's 1 ppb sits at the 56th percentile in Colorado and the 55th nationally (higher means more lead).
Other water systems in Larimer County
44 other systems share Larimer County; 25 of them have a higher latest lead result than Northern Colorado Wa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ft Collins City Of | 179,901 | 2.8 ppb |
| Loveland City Of | 91,077 | 3.3 ppb |
| Ft Collins Loveland Wd | 63,532 | 2 ppb |
| East Larimer County Wd | 27,944 | 3.9 ppb |
| Csu Main And West Housing Campus | 27,375 | 8 ppb |
| Little Thompson Wd | 25,654 | - |
| Estes Park Town Of | 16,722 | 1.4 ppb |
| Berthoud Town Of | 14,211 | 10 ppb |
| Wellington Town Of | 11,720 | 3.7 ppb |
| West Fort Collins Wd | 4,000 | 5.1 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Wellington, 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 Northern Colorado Wa 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.