Superior Water Light & Power Company
EPA ID: WI8160147 · 26,084 people served · 2 ZIP codes
In the most recent EPA reporting cycle, Superior Water Light & Power Company carried 20 violations still marked as unresolved — each remains active in the federal enforcement ledger while the utility continues operations for its service population of approximately 26,084 people across the area it supplies.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2021) to 3 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Superior Water Light & Power Company Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Superior Water Light & Power Company serves a community with a median household income of $75,146 and an estimated 34,024 residents across its service area. Approximately 70% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Superior Water Light & Power Company'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.
About 1% of homes in Douglas County, Wisconsin 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 Superior Water Light & Power Company 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.
Lead and Copper Rule at 10 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 6 mg/L exceeds the EPA maximum of mg/L.
Contaminant 1032 at 5 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 4 mg/L exceeds the EPA maximum of mg/L.
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
Similar-sized systems in Wisconsin
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
Superior Water Light & Power Company (EPA ID: WI8160147) is a community water system in Wisconsin that serves approximately 26,084 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: B (72/100)
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 |
|---|---|---|---|
| December 13, 2025 | Contaminant 0700 | Health-based | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| July 1, 2025 | Contaminant 1032 | Monitoring | Unresolved |
| May 2, 2025 | Chlorine residual | Health-based | Resolved |
| April 1, 2025 | Contaminant 1032 | Monitoring | Unresolved |
| March 26, 2025 | Stage 1 DBP Rule | Health-based | Unresolved |
| March 26, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| February 10, 2025 | Consumer Confidence Report Rule | Health-based | Resolved |
| February 10, 2025 | Consumer Confidence Report Rule | Monitoring | Resolved |
| February 10, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| January 16, 2025 | Total Coliform | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Contaminant 1032 | Monitoring | Resolved |
| October 1, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
| July 1, 2024 | Contaminant 1032 | Monitoring | Unresolved |
| July 1, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Treatment Failure | 10 | No |
| Stage 1 DBP Rule | Treatment Failure | 6 | Yes |
| Contaminant 1032 | Other Violation | 5 | No |
| Surface Water Treatment Rule | Treatment Failure | 4 | No |
| Consumer Confidence Report Rule | Reporting Failure | 4 | Yes |
| Stage 2 DBP Rule | Treatment Failure | 3 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 2 | No |
| Total Coliform | Microbiological | 2 | No |
| Chlorine residual | Disinfectant | 2 | Yes |
| Revised Total Coliform Rule | Microbiological | 2 | No |
| Total Organic Carbon | Disinfection Byproducts | 1 | No |
| Contaminant 0700 | Other Violation | 1 | Yes |
Health Risk Details
Chlorine (Residual Disinfectant) (EPA limit: 4 mg/L (MRDL — Maximum Residual Disinfectant Level))
Irritation & DBP formation at high levels; protective at normal treatment levels At-risk groups: people with asthma or chemical sensitivities, kidney dialysis patients (water must be dechlorinated).
Removal methods: granular activated carbon (GAC), KDF media filter, carbon block filter. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate 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 WI 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 Superior Water Light & Power Company (WI8160147) on EPA.gov.
Frequently Asked Questions
Is Superior Water Light & Power Company water safe to drink?
Superior Water Light & Power Company has recorded 9 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 Superior Water Light & Power Company serve?
Superior Water Light & Power Company serves approximately 26,084 people across 2 ZIP codes in Wisconsin.
Where does Superior Water Light & Power Company get its water?
The primary water source is surface water.
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 Superior Water, Light & Power Company 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: Superior Water, Light & Power Company Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
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 →
PFAS Substances Detected in This System
This water system's Consumer Confidence Report disclosed the following PFAS compounds. Levels are from the utility's most recent reporting cycle.
In April 2024, EPA finalized the first National Primary Drinking Water Regulation for six PFAS. Public water systems have until 2029 to comply. EPA — PFAS regulation overview →
Source: Consumer Confidence Report disclosed by Superior Water, Light & Power Company.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
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.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Federal compliance violations on record
These entries are taken verbatim from the utility's CCR violations section. EPA defines four broad violation categories: Maximum Contaminant Level (MCL), Treatment Technique (TT), Monitoring & Reporting (M&R), and Public Notification (PN).
-
reporting2025-02-25
Received a tier 2 violation from the EPA for its inventory not meeting federal regulatory requirements.
-
monitoring2024-10-17
Failed to develop an initial inventory for service line materials that meets federal requirements.
Violations record from Superior Water, Light & Power Company Consumer Confidence Report.
Notable events from the utility's CCR
These bullet entries are the utility's own narration of operational, regulatory, or infrastructure events during the reporting period.
- SWL&P received a tier 2 violation from the EPA on February 25th, 2025 for its inventory not meeting federal regulatory requirements.
- SWL&P failed to develop an inventory that meets all federal requirements and/or to make the inventory publicly accessible.
- SWL&P is working with the City of Superior, Village of Superior and WI DNR to gather well abandonment information.
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
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.
- #13 / 50 Highest Exposure Burden (Wisconsin)
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
Superior Water Light & Power Company (EPA ID: WI8160147) — request the latest Consumer Confidence Report or ask about specific contaminants.