Carter Lake Filter Plant, CO
Exceeded the action level in the past
Latest 90th-percentile lead: 2 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Carter Lake Filter Plant serves about 11 people through 10,730 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Larimer County, Colorado. EPA system ID: CO0135476; phone on file: 970-532-3624. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2024 (1.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Carter Lake Filter Plant is 22.2 ppb across 17 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2024 | 1.8 ppb |
| 2023 | 2.9 ppb |
| 2022 | 3.6 ppb |
| 2021 | 2.3 ppb |
| 2021 | 1.7 ppb |
| 2020 | 2.4 ppb |
| 2020 | 2 ppb |
| 2019 | 5.5 ppb |
| 2019 | 2.5 ppb |
| 2018 | 2.7 ppb |
| 2018 | 2.8 ppb |
| 2017 | 2.8 ppb |
| 2017 | 4.1 ppb |
| 2016 | 6.9 ppb |
| 2016 | 21.8 ppb over 15 |
| 2016 | 22.2 ppb over 15 |
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. Carter Lake Filter Plant's 2 ppb sits at the 67th percentile in Colorado and the 69th nationally (higher means more lead).
Nearby utilities
44 other systems share Larimer County; 16 of them have a higher latest lead result than Carter Lake Filter Plant. 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 |
| Northern Colorado Wa | 4,675 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Berthoud, 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 Carter Lake Filter Plant 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. Why an old exceedance still matters: over the limit before, under it now.