City of Colby
EPA ID: KS2019302 · 5,516 people served · 1 ZIP code
ZipCheckup's reading of EPA records for City of Colby (KS2019302): no drinking-water violations recorded since 2021. Federal monitoring records show zero violations at City of Colby for the reporting cycles they cover, at a utility serving approximately 5,516 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for City of Colby Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with City of Colby have a median household income of $72,188 and about 6,166 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 79% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
City of Colby's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 90th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Kansas
System Overview
City of Colby, (EPA ID: KS2019302) is a community water system in Kansas that serves approximately 5,516 people from groundwater sources.
This system serves ZIP code 67701 in Colby.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0013 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
1 of 1 ZIP records with known zones is in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
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 KS or modeled from parcel and building-footprint data.
- 67701 - Colby
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Colby (KS2019302) on EPA.gov.
Frequently Asked Questions
Is City of Colby water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for City of Colby in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does City of Colby serve?
City of Colby serves approximately 5,516 people across 1 ZIP code in Kansas.
Where does City of Colby get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). City of Colby Water Quality Report, KS. https://zipcheckup.com/water-system/ks2019302/
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author = {{ZipCheckup}},
title = {{City of Colby Water Quality Report, KS}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ks2019302/}
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