Is Zion, CO Tap Water Safe to Drink?
Graded A with no contaminants above EPA limits. Here's everything we tested and how Zion ranks. What to do next ↓
90.3/100
waterverge.com Zion, CO — Water Quality Report
Zion's drinking water received a grade of A (90.3 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 624 residents using purchased surface water.
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 8 violations on record, including 0 health-based violations. All violations have been resolved.
What to know about Zion's water
Zion ranks #18 out of 246 cities in Colorado for water quality, placing it one of the best in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Zion may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 6 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Zion, CO water safe to drink?
Based on EPA testing data, Zion's tap water is generally safe to drink. The water system earned a grade of A (90.3/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 624 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Zion
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Zion's water quality assessment. Grade: A (90.3/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Zion's water supply.
Well within EPA limits.
Violation history
Zion's water system has 8 total violations on record, including 0 health-based violations. All violations have been resolved. 6 violations were issued in the last 5 years.
Where does Zion's water come from?
Zion's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 624 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Lee Gulch (river), Dutch (river), South Platte River Below Union Ave, (river), Little Dry Creek Nr Arapahoe (river), Little Dry Creek Above Englewood (river).
What Zion residents can do
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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D4 — exceptional droughtLake County is currently in D4 (exceptional drought) per the U.S. Drought Monitor (week of May 5, 2026). 96.3% of the county is in D4 (exceptional) drought. Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
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 Zion compares by contaminant
Explore where Zion ranks among all Colorado cities for specific contaminants.
Water source & infrastructure
Where Zion's water comes from
Zion's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by private ownership and serves approximately 624 people through 1 water system.
Water bodies near Zion
Zion is located near 5 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Zion
| System Name | PWSID | Population | Source |
|---|---|---|---|
| BEACH MHP | IL0970010 | 624 | SWP |
How Zion compares
Full Colorado rankings →Zion's score of 90.3/100 is above the average of 45/100 among major Colorado cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Colorado rankings →About Zion, CO
Wikipedia →Denver is the capital and most populous city of the U.S. state of Colorado. Officially a consolidated city and county, it is located in the South Platte River valley on the western edge of the High Plains, and is just east of the Front Range of the Rocky Mountains (Rockies). Denver is the 19th-most populous city in the United States and the fifth-most populous state capital, with a population of 715,522 at the 2020 census. The ten-county Denver metropolitan area, with over 3.05 million residents, is the 19th-largest metropolitan area in the country and functions as the economic and cultural center of the broader Front Range Urban Corridor.
Learn more about your water
Guides and resources related to Zion's water quality findings.
Explore water quality across Lake
Frequently asked questions
Is Zion, CO tap water safe to drink?
Zion's water quality earned a grade of A (90.3/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #18 out of 246 cities tested in Colorado.
What contaminants are in Zion's water?
Lead was measured at 0.0 ppb (90th percentile). 8 violations are on record.
How is Zion'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 Zion?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Zion's water come from?
Zion's water is sourced from Purchased surface water. The city has 1 water system serving approximately 624 residents.
How does Zion's water compare to other cities?
Zion ranks #18 out of 246 cities in Colorado (better than 93% of state cities) and #2318 out of 15744 cities nationally (85th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Zion's small water system affect quality?
Zion's system serves approximately 624 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 8 violations on record.