Is Williamsburg, CO Tap Water Safe to Drink?
Graded B, with 23 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
75.8/100
waterverge.com Williamsburg, CO — Water Quality Report
Williamsburg's drinking water received a grade of B (75.8 out of 100), indicating good water quality. The city's 1 water system serves approximately 775 residents using purchased surface water.
Lead levels were measured at 2.0 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 37 violations on record, including 0 health-based violations. 23 remain unresolved.
What to know about Williamsburg's water
Williamsburg ranks #99 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.
As a small community water system, Williamsburg may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Williamsburg, CO water safe to drink?
Williamsburg's drinking water has significant quality concerns based on EPA testing data. With a grade of B (75.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 775 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Williamsburg
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Williamsburg's water quality assessment. Grade: B (75.8/100).
Contaminants: Public Notice.
Contaminants: Revised Total Coliform Rule, Total Haloacetic Acids (HAA5).
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4229). Flood event — may have impacted local water infrastructure.
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 Williamsburg's water supply.
Well within EPA limits.
Violation history
Williamsburg's water system has 37 total violations on record, including 0 health-based violations. 23 remain unresolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
Fremont County has experienced 4 federally declared disasters since 2005. 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 Arkansas River.
Where does Williamsburg's water come from?
Williamsburg's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 775 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Arkansas River (river).
What Williamsburg residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Williamsburg'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.
Williamsburg'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 Williamsburg
Industrial polluters nearby
Reported releases to surface water by facilities near Williamsburg, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
HOLCIM (US) INC PORTLAND PLANT FLORENCE, CO81226 | — | — | 5.3 mi |
FCC FLORENCE FLORENCE, CO81226 | — | — | 3.8 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Williamsburg
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- LINCOLN PARK3.0 mi
Source: EPA Superfund National Priorities List
Drought conditions
D2 — severe droughtFremont County is currently in D2 (severe 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
Fremont County has experienced 4 federally declared disasters since 2005. 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. | 2.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Williamsburg compares by contaminant
Explore where Williamsburg ranks among all Colorado cities for specific contaminants.
Water source & infrastructure
Where Williamsburg's water comes from
Williamsburg'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 775 people through 1 water system.
Water bodies near Williamsburg
Williamsburg is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Williamsburg
| System Name | PWSID | Population | Source |
|---|---|---|---|
| WILLIAMSBURG TOWN OF | CO0122950 | 775 | SWP |
How Williamsburg compares
Full Colorado rankings →Williamsburg's score of 75.8/100 is above the average of 45/100 among major Colorado cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Colorado rankings →About Williamsburg, CO
Wikipedia →Williamsburg is a statutory town located in Fremont County, Colorado, United States. The town population was 731 at the 2020 census. The Florence post office serves Williamsburg.
Learn more about your water
Guides and resources related to Williamsburg's water quality findings.
Explore water quality across Fremont
Frequently asked questions
Is Williamsburg, CO tap water safe to drink?
Williamsburg's water quality earned a grade of B (75.8/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #99 out of 246 cities tested in Colorado.
What contaminants are in Williamsburg's water?
Lead was measured at 2.0 ppb (90th percentile). 37 violations are on record.
How is Williamsburg'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 Williamsburg?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Williamsburg's water come from?
Williamsburg's water is sourced from Purchased surface water. The city has 1 water system serving approximately 775 residents.
How does Williamsburg's water compare to other cities?
Williamsburg ranks #99 out of 246 cities in Colorado (better than 60% of state cities) and #9488 out of 15744 cities nationally (40th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Williamsburg's small water system affect quality?
Williamsburg's system serves approximately 775 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 37 violations on record.