Cottonwood Water Supply District
EPA ID: CO0118020 · 10,867 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Cottonwood Water Supply District (CO0118020): 7 EPA violations in the last five years. Cottonwood Water Supply District recorded 7 EPA violations over the past five years, all of which have since been resolved - the utility is currently in compliance serving 10,867 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Cottonwood Water Supply District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Cottonwood Water Supply District serves a community with a median household income of $142,162 and an estimated 150,443 residents across its service area.
🌊 Where Does Your Water Come From?
Cottonwood Water Supply District's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Infrastructure Risk
Detected Contaminants
How Cottonwood Water Supply District compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 2 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Total Trihalomethanes (TTHM) at 2 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 15 detections recorded. 3 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Cottonwood Water Supply District (EPA ID: CO0118020) is a community water system in Colorado that serves approximately 10,867 people from surface water sources.
This system provides water to 3 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 7 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Stage 1 DBP Rule | Non-health-based | Resolved |
| March 24, 2025 | Lead and Copper Rule | Non-health-based | Resolved |
| October 1, 2024 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| October 1, 2024 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
| July 1, 2023 | Surface Water Treatment Rule | Non-health-based | Resolved |
| July 1, 2022 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| July 1, 2022 | Total Trihalomethanes (TTHM) | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 2 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 2 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| Lead and Copper Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CO or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Cottonwood Water Supply District (CO0118020) on EPA.gov.
Frequently Asked Questions
Is Cottonwood Water Supply District water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Cottonwood Water Supply District; its 7 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Cottonwood Water Supply District serve?
Cottonwood Water Supply District serves approximately 10,867 people across 3 ZIP codes in Colorado.
Where does Cottonwood Water Supply District get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
- #46 / 50 Highest Exposure Burden (Colorado)
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Cottonwood Water Supply District (CO): 7 EPA Violations. https://zipcheckup.com/water-system/co0118020/
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Cottonwood Water Supply District (EPA ID: CO0118020) - request the latest Consumer Confidence Report or ask about specific contaminants.