Westminster, Colorado’s Home for Water Softeners, Water Filters,
& Water Delivery

Yes. Westminster’s drinking water meets federal and state drinking water standards. The city completes required testing for regulated contaminants, and results are reviewed to confirm compliance with Safe Drinking Water Act requirements.

Yes. Westminster’s tap water is considered moderately hard, with total hardness levels typically ranging between 112–149 parts per million (ppm) as calcium carbonate. This hardness range can contribute to mineral scale buildup in pipes, water heaters, fixtures, and appliances, reduce soap efficiency, and leave residue on glassware and surfaces.

Recent sampling for Westminster, Colorado drinking water has detected the presence of PFAS. The EPA is in the process of setting new maximum contaminant levels (MCLs), which range from 4 to 10 parts per trillion, equal to 0.00000000004 for PFOA and PFOS individually, and up to 0.0000000001 for PFNA, PFHxS, and HFPO-DA (GenX chemicals). As you can see in the water quality report, many samples do not meet these standards. Click here to learn more about our whole house PFAS filtration systems.

Yes. Fluoride is present in Westminster tap water at an average level of approximately 0.57 ppm, which is below the EPA maximum contaminant level of 4.0 ppm. Fluoride enters the water through the natural erosion of mineral deposits and is monitored regularly as part of Westminster’s routine water quality testing program.

Westminster’s drinking water primarily originates as snowmelt from the eastern slope of the Rocky Mountains, which flows into Clear Creek and is diverted through a complex canal system into Standley Lake, the city’s main water storage reservoir. Standley Lake can store up to 14 billion gallons of water, supplying approximately one year of drinking water for Westminster customers. Water levels and quality vary seasonally based on snowpack, rainfall, and regional weather conditions.

Westminster treats its drinking water using a four-step process at municipal treatment facilities. This includes coagulation, flocculation, and sedimentation to remove particles, followed by filtration using sand, anthracite, and membrane systems to remove fine material. Chlorine disinfection is then applied to eliminate bacteria and viruses, and treated water is stored before being distributed through over 550 miles of water lines to homes and businesses.

Many Westminster homeowners choose water treatment systems due to moderately hard water levels ranging from 112–149 ppm, which can contribute to scale buildup in plumbing, appliances, and fixtures. Additional filtration is also commonly used to address taste, odor, sediment, and trace contaminants that remain present even after municipal treatment.

Westminster operates an extensive water quality monitoring program that includes more than 1,700 water samples collected annually, generating over 5,000 laboratory test results, along with 15,000+ manual quality control checks and 150 continuous monitoring locations throughout the treatment and distribution system. Testing occurs across source waters, treatment facilities, storage tanks, and distribution lines to track water quality and treatment performance.

However, between December 29, 2024 and January 15, 2025, Westminster reported a non-health-based monitoring and reporting violation after failing to properly collect and document required free chlorine testing data, which prevented confirmation of regulatory compliance for that period. Although total chlorine levels were recorded and did not exceed state safety limits, the lapse represented a data collection and oversight failure. The city stated that monitoring procedures were corrected on January 15, 2025.

You can access the most recent Westminster’s Tap Water Quality Report here.