Is West Columbia, CO Tap Water Safe to Drink?
Graded B+, with 10 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
80.6/100
waterverge.com West Columbia, CO — Water Quality Report
West Columbia's drinking water received a grade of B+ (80.6 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,056 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 16 violations on record, including 1 health-based violation. 10 remain unresolved.
What to know about West Columbia's water
West Columbia ranks #78 out of 246 cities in Colorado for water quality, placing it mid-range in the state.
West Columbia relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, West Columbia may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is West Columbia, CO water safe to drink?
West Columbia's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (80.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,056 residents using groundwater (wells).
Recent water quality updates for West Columbia
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into West Columbia's water quality assessment. Grade: B+ (80.6/100).
Contaminants: Lead and Copper Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4731). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4145). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for West Columbia's water supply.
Well within EPA limits.
Violation history
West Columbia's water system has 16 total violations on record, including 1 health-based violation. 10 remain unresolved. 4 violations were issued in the last 5 years.
Flood & environmental risk
Arapahoe County has experienced 6 federally declared disasters since 1969. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Plum Creek, Lee Gulch, Dutch, Big Dry Creek Below C-470, South Platte River Below Union Ave,.
Where does West Columbia's water come from?
West Columbia's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,056 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Plum Creek (river), Lee Gulch (river), Dutch (river), Big Dry Creek Below C-470 (river), South Platte River Below Union Ave, (river).
What West Columbia residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in West Columbia's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
West Columbia's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Flood & disaster history
Arapahoe County has experienced 6 federally declared disasters since 1969. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how West Columbia compares by contaminant
Explore where West Columbia ranks among all Colorado cities for specific contaminants.
Water source & infrastructure
Where West Columbia's water comes from
West Columbia's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by private ownership and serves approximately 1,056 people through 1 water system.
Water bodies near West Columbia
West Columbia is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving West Columbia
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ROLLING MEADOWS MHP (3260027) | SC3260027 | 1,056 | GW |
How West Columbia compares
Full Colorado rankings →West Columbia's score of 80.6/100 is above the average of 45/100 among major Colorado cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Colorado rankings →About West Columbia, CO
Learn more about your water
Guides and resources related to West Columbia's water quality findings.
Explore water quality across Lexington
Frequently asked questions
Is West Columbia, CO tap water safe to drink?
West Columbia's water quality earned a grade of B+ (80.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #78 out of 246 cities tested in Colorado.
What contaminants are in West Columbia's water?
Lead was measured at 0.0 ppb (90th percentile). 16 violations are on record.
How is West Columbia's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in West Columbia?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does West Columbia's water come from?
West Columbia's water is sourced from Groundwater. The city has 1 water system serving approximately 1,056 residents.
What health violations has West Columbia's water system had?
West Columbia has 1 health-based violation on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 10 violations remain unresolved.
Is West Columbia's groundwater at risk of contamination?
West Columbia uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 16 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does West Columbia's water compare to other cities?
West Columbia ranks #78 out of 246 cities in Colorado (better than 68% of state cities) and #7795 out of 15744 cities nationally (51th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does West Columbia's small water system affect quality?
West Columbia's system serves approximately 1,056 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 16 violations on record.