City of Mason
EPA ID: MI0004170 · 8,252 people served · 1 ZIP code
ZipCheckup's reading of EPA records for City of Mason (MI0004170): 5 violations on record since 2021. 5 violations on file at City of Mason, none open; 8,252 people served.
Data: EPA SDWIS
Service Area Map
Coverage area for City of Mason Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: B
Demographics of ZIP Codes Served
The ZIP codes associated with City of Mason have a median household income of $91,956 and about 19,403 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 60% 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 Mason'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 70th 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 Michigan
System Overview
City of Mason, (EPA ID: MI0004170) is a community water system in Michigan that serves approximately 8,252 people from groundwater sources.
This system serves ZIP code 48854 in Mason.
ZIP-Area Home Safety Context: B (81/100)
This is the average Home Safety Score for 1 of 1 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Status breakdown for accepted records with record years 2021-2026: 5 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, 2023 | Consumer Confidence Rule | Non-health-based | Resolved |
| January 1, 2023 | TTHM | Non-health-based | Resolved |
| January 1, 2023 | Total Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| January 1, 2022 | Combined Radium (-226 and -228) | Non-health-based | Resolved |
| July 1, 2021 | Consumer Confidence Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Rule | Other (notice or report rule) | 2 | No |
| Total Haloacetic Acids (HAA5) | Monitoring & Reporting | 1 | No |
| TTHM | Monitoring & Reporting | 1 | No |
| Combined Radium (-226 and -228) | Monitoring & Reporting | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0017 mg/L | No | 2025-12-31 |
The accepted LCR snapshot contains 1 reported copper action-level exceedance record for this PWSID. The source does not provide a verified copper level for publication.
Radon Risk in Service Area
1 of 1 ZIP records with known zones is in EPA Radon Zone 2.
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 MI or modeled from parcel and building-footprint data.
- 48854 - Mason
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Mason (MI0004170) on EPA.gov.
Frequently Asked Questions
Is City of Mason water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for City of Mason; its 5 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does City of Mason serve?
City of Mason serves approximately 8,252 people across 1 ZIP code in Michigan.
Where does City of Mason 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 Mason (MI): 5 EPA Violations. https://zipcheckup.com/water-system/mi0004170/
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url = {https://zipcheckup.com/water-system/mi0004170/}
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What You Can Do
Test your water
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Check your specific ZIP code
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Contact your utility
City of Mason (EPA ID: MI0004170) - request the latest Consumer Confidence Report or ask about specific contaminants.