Marshalltown Water Works
EPA ID: IA6469042 · 27,591 people served · 1 ZIP code
Pulled from the federal compliance ledger, 9 violations at Marshalltown Water Works remain without resolution — the utility delivers drinking water to roughly 27,591 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Marshalltown Water Works Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Marshalltown Water Works serves a community with a median household income of $71,212 and an estimated 31,163 residents across its service area. Approximately 83% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Marshalltown Water Works's water is pumped from underground aquifers. 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.
About 1% of homes in Marshall County, Iowa rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Marshalltown Water Works compares to EPA limits
What This Means For You
Lead at 9 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
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.
Stage 1 DBP Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Copper at 3 mg/L exceeds the EPA maximum of 1.3 mg/L.
Lead and Copper Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Lead was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Iowa
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
Marshalltown Water Works (EPA ID: IA6469042) is a community water system in Iowa that serves approximately 27,591 people from groundwater sources.
This system serves ZIP code 50158 in Marshalltown.
Average Home Safety Score: D (47/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| August 1, 2025 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| April 1, 2025 | Copper | Monitoring | Unresolved |
| August 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| July 1, 2024 | Copper | Monitoring | Resolved |
| April 1, 2024 | Lead | Monitoring | Unresolved |
| April 1, 2024 | Lead | Health-based | Resolved |
| March 1, 2024 | Lead | Health-based | Resolved |
| January 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| December 15, 2023 | Lead and Copper Rule | Monitoring | Unresolved |
| December 1, 2023 | Stage 1 DBP Rule | Monitoring | Resolved |
| December 1, 2023 | Lead | Health-based | Unresolved |
| November 1, 2023 | Lead | Health-based | Unresolved |
| October 1, 2023 | Contaminant 1032 | Monitoring | Resolved |
| May 1, 2023 | Unknown | Monitoring | Resolved |
| May 1, 2023 | Lead | Health-based | Unresolved |
| April 29, 2023 | Lead and Copper Rule | Monitoring | Unresolved |
| April 1, 2023 | Lead | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead | Inorganic | 9 | Yes |
| Copper | Inorganic | 3 | No |
| Stage 1 DBP Rule | Treatment Failure | 3 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 2 | No |
| Lead and Copper Rule | Treatment Failure | 2 | No |
| Contaminant 1032 | Other Violation | 1 | No |
| Contaminant 1052 | Other Violation | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
Health Risk Details
Lead (EPA limit: 0.015 mg/L (action level))
Brain damage in children, kidney & blood pressure in adults At-risk groups: infants, children under 6, pregnant women.
Removal methods: reverse osmosis, distillation, certified carbon block filter (NSF/ANSI 53). Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 50158 | 0.002 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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 IA or modeled from parcel and building-footprint data.
- 50158 — Marshalltown
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Marshalltown Water Works (IA6469042) on EPA.gov.
Frequently Asked Questions
Is Marshalltown Water Works water safe to drink?
Marshalltown Water Works has recorded 6 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Marshalltown Water Works serve?
Marshalltown Water Works serves approximately 27,591 people across 1 ZIP code in Iowa.
Where does Marshalltown Water Works get its water?
The primary water source is groundwater.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from Marshalltown Water Works Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: Marshalltown Water Works Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
The Buried Sand and Gravel aquifer was determined to have low susceptibility to contamination because the characteristics of the aquifer and overlying materials provide natural protection from contaminants at the land surface. The Mississippian aquifer was determined to be susceptible to contamination because the characteristics of the aquifer and overlying material provide some protection from contaminants from the land surface.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Watershed exposure sources reported
Land-use and natural conditions identified in the utility's source-water assessment as potential contamination sources upstream of treatment.
Treatment classification and chemical list sourced from Marshalltown Water Works Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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 →
Our water supply has completed a service line inventory. Please contact us for information regarding the inventory and how you can access the results.
Lead Service Line Replacement Tracker
This water utility's lead service line (LSL) replacement program is tracked from public Consumer Confidence Report filings. Email signup notifies subscribers when the utility files an updated replacement plan or progress milestone.
Marshalltown Water Works
ZipCheckup is not affiliated with this water utility. LSL replacement-program data is sourced from public CCR filings published by the utility. Subscription notifications are based on automated parsing of subsequent CCR releases.
Learn more about Lead and Copper Rule replacement requirements →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
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.
Frequently Asked Questions
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
Marshalltown Water Works (EPA ID: IA6469042) — request the latest Consumer Confidence Report or ask about specific contaminants.