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Fifth Unregulated Contaminant Monitoring Rule (UCMR 5)#

Starting in January 2025, Fort Collins Utilities has been participating in the U.S. Environmental Protection Agency’s (EPA) Fifth Unregulated Contaminant Monitoring Rule (UCMR 5). 

Water providers nationwide monitor unregulated contaminants to help the EPA determine the frequency of these contaminants in drinking water and determine whether they need to be regulated in the future. EPA uses the UCMR to collect data on contaminants that are suspected of being in drinking water but do not have health-based standards set under the Safe Drinking Water Act (SDWA).

Utilities is committed to protecting public health and supporting EPA’s research. UCMR 5 will provide new data that will improve EPA’s understanding of the frequency that 29 per- and polyfluoroalkyl substances (PFAS) and lithium are found in the nation’s drinking water systems, and at what levels. The monitoring data on PFAS and lithium will help the EPA determine future regulations and other actions to protect public health under the SDWA. As data is collected throughout 2025, it will be posted here.

Summary of Water Quality Testing Results for Parameters Included in UCMR 5 Test List#

Parameter Class Parameter Result Units Untreated/Treated Water Sample Date
PFAS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) <2 ng/L Treated 1/28/2025
PFAS 1H,1H,2H,2H-Perfluorodecane sulfonic acid (8:2 FTS) <2 ng/L Treated 1/28/2025
PFAS 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) <2 ng/L Treated 1/28/2025
PFAS 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) <2 ng/L Treated 1/28/2025
PFAS 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) <2 ng/L Treated 1/28/2025
PFAS 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid(9Cl-PF3ONS) <2 ng/L Treated 1/28/2025
PFAS Hexafluoropropylene Oxide Dimer Acid (HFPO-DA) <2 ng/L Treated 1/28/2025
PFAS Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) <2 ng/L Treated 1/28/2025
PFAS Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) <2 ng/L Treated 1/28/2025
PFAS Perfluoro-3-methoxypropanoic acid (PFMPA) <2 ng/L Treated 1/28/2025
PFAS Perfluoro-4-methoxybutanoic acid  (PFMBA) <2 ng/L Treated 1/28/2025
PFAS Perfluorobutanesulfonic acid (PFBS) <2 ng/L Treated 1/28/2025
PFAS Perfluorobutanoic acid (PFBA) <2 ng/L Treated 1/28/2025
PFAS Perfluorodecanoic acid (PFDA) <2 ng/L Treated 1/28/2025
PFAS Perfluorododecanoic acid (PFDoA) <2 ng/L Treated 1/28/2025
PFAS Perfluoroheptanesulfonic acid (PFHpS) <2 ng/L Treated 1/28/2025
PFAS Perfluoroheptanoic acid (PFHpA) <2 ng/L Treated 1/28/2025
PFAS Perfluorohexanesulfonic acid (PFHxS) <2 ng/L Treated 1/28/2025
PFAS Perfluorohexanoic acid (PFHxA) <2 ng/L Treated 1/28/2025
PFAS Perfluorononanoic acid (PFNA) <2 ng/L Treated 1/28/2025
PFAS Perfluorooctanesulfonic acid (PFOS) <2 ng/L Treated 1/28/2025
PFAS Perfluorooctanoic acid (PFOA) <2 ng/L Treated 1/28/2025
PFAS Perfluoropentanesulfonic acid (PFPeS) <2 ng/L Treated 1/28/2025
PFAS Perfluoropentanoic acid (PFPeA) <2 ng/L Treated 1/28/2025
PFAS Perfluoroundecanoic acid (PFUnA) <2 ng/L Treated 1/28/2025
PFAS N-ethylperfluorooctanesulfonamidoacetic acid (NEtFOSAA) <2 ng/L Treated 1/28/2025
PFAS N-methylperfluorooctanesulfonamidoacetic acid (NMeFOSAA) <2 ng/L Treated 1/28/2025
PFAS Perfluorotetradecanoic acid (PFTA) <2 ng/L Treated 1/28/2025
PFAS Perfluorotridecanoic acid (PFTrDA) <2 ng/L Treated 1/28/2025
Metals Lithium <9 ug/L Treated 1/28/2025

Did You Know?

Replacing some bluegrass with low water-using planting beds can save water and money.

Installing high-efficiency refrigeration equipment at your business, such as zero-energy doors and anti-sweat heater controls (rebates available), can save money.

We offer several residential and commercial programs to help you save energy, water and money.