Is Ault, CO Tap Water Safe to Drink?
Graded B+, with 5 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
81.2/100
waterverge.com Ault, CO — Water Quality Report
Ault's drinking water received a grade of B+ (81.2 out of 100), indicating good water quality. The city's 1 water system serves approximately 4,220 residents using purchased surface water.
Lead levels were measured at 1.3 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 7 violations on record, including 0 health-based violations. 5 remain unresolved.
What to know about Ault's water
Ault ranks #77 out of 246 cities in Colorado for water quality, placing it mid-range 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.
Water quality score
See methodology →Is Ault, CO water safe to drink?
Ault's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (81.2/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 4,220 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Ault
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Ault's water quality assessment. Grade: B+ (81.2/100).
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Contaminants: Consumer Confidence Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4145). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3365). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Ault's water supply.
Well within EPA limits.
Violation history
Ault's water system has 7 total violations on record, including 0 health-based violations. 5 remain unresolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
Weld County has experienced 7 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.
Where does Ault's water come from?
Ault's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 4,220 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Ault residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Ault'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.
Ault'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
Top industrial polluters within 10 miles of Ault
Industrial polluters nearby
Reported releases to surface water by facilities near Ault, ranked by pounds discharged annually.
Total reported releases to surface water: 5 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
LOVELAND PRODUCTS GREELEY, CO80631 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 5 | 9.7 mi |
MARTIN MARIETTA GREELEY 35TH AVE GREELEY, CO80631 | — | — | 9.8 mi |
AFCO STEEL GREELEY, CO80631 | — | — | 9.5 mi |
FLORIDA CIRTECH INC. GREELEY, CO80631 | — | — | 9.9 mi |
PIERCE GAS PLANT PIERCE, CO80650 | — | — | 5.1 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtWeld County is currently in D3 (extreme drought) per the U.S. Drought Monitor (week of May 5, 2026). 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.
Flood & disaster history
Weld County has experienced 7 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. | 1.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Ault compares by contaminant
Explore where Ault ranks among all Colorado cities for specific contaminants.
Water source & infrastructure
Where Ault's water comes from
Ault'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 local government ownership and serves approximately 4,220 people through 1 water system.
Water systems serving Ault
| System Name | PWSID | Population | Source |
|---|---|---|---|
| AULT TOWN OF | CO0162125 | 4,220 | SWP |
How Ault compares
Full Colorado rankings →Ault's score of 81.2/100 is above the average of 45/100 among major Colorado cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Colorado rankings →About Ault, CO
Learn more about your water
Guides and resources related to Ault's water quality findings.
Explore water quality across Weld
Frequently asked questions
Is Ault, CO tap water safe to drink?
Ault's water quality earned a grade of B+ (81.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #77 out of 246 cities tested in Colorado.
What contaminants are in Ault's water?
Lead was measured at 1.3 ppb (90th percentile). 7 violations are on record.
How is Ault'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 Ault?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Ault's water come from?
Ault's water is sourced from Purchased surface water. The city has 1 water system serving approximately 4,220 residents.
How does Ault's water compare to other cities?
Ault ranks #77 out of 246 cities in Colorado (better than 69% of state cities) and #7554 out of 15744 cities nationally (52th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.