Skip to main content

Unregulated Contaminant Monitoring Rule (UCMR 4)#

Between April 2019-June 2020, Fort Collins Utilities participated in the U.S. Environmental Protection Agency’s (EPA) Fourth Unregulated Contaminant Monitoring Rule (UCMR 4).

Approximately 6,000 utilities nationwide monitored unregulated contaminants for a year to help the EPA determine the occurrence of these contaminants in drinking water and whether they need to be regulated in the future. EPA uses the UCMR to collect data for contaminants that are suspected to be present in drinking water and do not have health-based standards set under the Safe Drinking Water Act. We are committed to protecting public health and support EPA’s research.

UCMR 4 included monitoring for a total of 30 chemical contaminants: 10 cyanotoxins (nine cyanotoxins and one cyanotoxin group) and 20 additional contaminants (two metals, eight pesticides, one pesticide manufacturing byproduct, three haloacetic acid [HAA] groups, three alcohols, and three semivolatile organic chemicals [SVOCs]). Learn more »  

Summary of Water Quality Testing Results* for Parameters Included in UCMR 4 Test List#

*This table only includes parameters that are also included in the UCMR 4 test list. View our annual Water Quality Report for details on routine water quality testing. 

Parameter Class Parameter Units Average Untreated/Treated Water
Cyanotoxins Total microcystins ug/L No detections Treated
Cyanotoxins Microcystin-LR ug/L No detections Treated
Cyanotoxins Microcystin-LA ug/L No detections Treated
Cyanotoxins Microcystin-LY ug/L No detections Treated
Cyanotoxins Microcystin-RR ug/L No detections Treated
Cyanotoxins Microcystin-LF ug/L No detections Treated
Cyanotoxins Microcystin-YR ug/L No detections Treated
Cyanotoxins Nodularin ug/L No detections Treated
Cyanotoxins Cylindrospermopsin ug/L No detections Treated
Cyanotoxins Anatoxin-a ug/L No detections Treated
HAA Indicators Total Organic Carbon ug/L 2900 Untreated Horsetooth
HAA Indicators Total Organic Carbon ug/L 3600 Untreated Poudre
HAA Indicators Bromide ug/L No detections Untreated Horsetooth
HAA Indicators Bromide ug/L No detections Untreated Poudre
Haloacetic Acids HAA5 ug/L 23.2 Treated
Haloacetic Acids HAA6 ug/L 1.9 Treated
Haloacetic Acids HAA9 ug/L 23.4 Treated
Metals Manganese ug/L 1.2 Treated
Metals Germanium ug/L No detections Treated
Alcohols 1-Butanol ug/L No detections Treated
Alcohols 2-Methoxyethanol ug/L No detections Treated
Alcohols 2-Propen-1-ol ug/L No detections Treated
Pesticide a-BHC ug/L No detections Treated
Pesticide Chlorpyrifos ug/L No detections Treated
Pesticide Dimethipin ug/L No detections Treated
Pesticide Ethoprop ug/L No detections Treated
Pesticide Oxyfluorfen ug/L No detections Treated
Pesticide Profenofos ug/L No detections Treated
Pesticide Permethrin ug/L No detections Treated
Pesticide Tebuconazole ug/L No detections Treated
Pesticide Tribufos ug/L No detections Treated
Pesticide o-Toluidine ug/L No detections Treated
Pharmaceutical Quinoline ug/L No detections Treated

Did You Know?

Planting fast-growing vines is a quick way to block unwanted summer sun. You'll get results in months.

Cleaning your dryer filter regularly prevents lint build ups that can reduce airflow resulting in clothes not drying completely.

You can save water when washing fruits or vegetables by filling the sink with water instead of running the faucet.