Is Nederland, CO Tap Water Safe to Drink?
Graded A-, with 8 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.6/100
waterverge.com Nederland, CO — Water Quality Report
Nederland's drinking water received a grade of A- (87.6 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,406 residents using surface water.
Lead levels were measured at 1.0 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 26 violations on record, including 5 health-based violations. 8 remain unresolved.
What to know about Nederland's water
Nederland ranks #36 out of 246 cities in Colorado for water quality, placing it above average 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, Nederland may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Nederland, CO water safe to drink?
Nederland's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (87.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,406 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Nederland
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Nederland's water quality assessment. Grade: A- (87.6/100).
Contaminants: Lead and Copper 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.
Contaminants: Interim Enhanced Surface Water Treatment Rule.
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Nederland's water supply.
Well within EPA limits.
Violation history
Nederland's water system has 26 total violations on record, including 5 health-based violations. 8 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Boulder 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 Fourmile Creek, Left Hand Creek.
Where does Nederland's water come from?
Nederland's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 2,406 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Fourmile Creek (river), Left Hand Creek (river).
What Nederland residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Nederland'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.
Nederland'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
Superfund sites within 10 miles of Nederland
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.
- CAPTAIN JACK MILL6.7 mi
Source: EPA Superfund National Priorities List
Drought conditions
D4 — exceptional droughtBoulder County is currently in D4 (exceptional drought) per the U.S. Drought Monitor (week of May 5, 2026). 0.0% 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.
Flood & disaster history
Boulder 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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Nederland compares by contaminant
Explore where Nederland ranks among all Colorado cities for specific contaminants.
Water source & infrastructure
Where Nederland's water comes from
Nederland'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 2,406 people through 1 water system.
Water bodies near Nederland
Nederland is located near 2 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Nederland
| System Name | PWSID | Population | Source |
|---|---|---|---|
| NEDERLAND TOWN OF | CO0107538 | 2,406 | SW |
How Nederland compares
Full Colorado rankings →Nederland's score of 87.6/100 is above the average of 45/100 among major Colorado cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Colorado rankings →About Nederland, CO
Learn more about your water
Guides and resources related to Nederland's water quality findings.
Explore water quality across Boulder
Frequently asked questions
Is Nederland, CO tap water safe to drink?
Nederland's water quality earned a grade of A- (87.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #36 out of 246 cities tested in Colorado.
What contaminants are in Nederland's water?
Lead was measured at 1.0 ppb (90th percentile). 26 violations are on record.
How is Nederland'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 Nederland?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Nederland's water come from?
Nederland's water is sourced from Surface water. The city has 1 water system serving approximately 2,406 residents.
What health violations has Nederland's water system had?
Nederland has 5 health-based violations on record. The most recent violation was recorded in January 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
How does Nederland's water compare to other cities?
Nederland ranks #36 out of 246 cities in Colorado (better than 85% of state cities) and #3946 out of 15744 cities nationally (75th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Nederland's small water system affect quality?
Nederland's system serves approximately 2,406 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 26 violations on record.