Joliet
EPA ID: IL1970450 · 160,000 people served · 17 ZIP codes
While corrective steps may be in progress, Joliet currently shows 28 EPA violations unresolved — serving a population of approximately 160,000.
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 2 (2021) to 2 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Joliet Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Joliet serves a community with a median household income of $113,129 and an estimated 420,716 residents across its service area. Approximately 44% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Joliet'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 Will County, Illinois rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 72th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Detected Contaminants
How Joliet compares to EPA limits
What This Means For You
Total Trihalomethanes (TTHM) at 7 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Stage 2 DBP Rule at 9 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 8 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 7 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 7 presence exceeds the EPA maximum of presence.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 31 detections recorded. 6 exceed federal EPA limits (4 ppt for PFOA/PFOS). 3 exceed state limits.
Total Trihalomethanes (TTHM) 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
Joliet (EPA ID: IL1970450) is a community water system in Illinois that serves approximately 160,000 people from groundwater sources.
This system provides water to 17 ZIP codes across 11 communities.
Average Home Safety Score: D (51/100)
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 22, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| August 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| August 1, 2025 | Revised Total Coliform Rule | Monitoring | Resolved |
| July 2, 2025 | Stage 2 DBP Rule | Monitoring | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| July 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| May 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| May 1, 2025 | Revised Total Coliform Rule | Monitoring | Resolved |
| April 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| January 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 2 DBP Rule | Treatment Failure | 9 | Yes |
| Surface Water Treatment Rule | Treatment Failure | 8 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 7 | No |
| Lead and Copper Rule | Treatment Failure | 7 | No |
| Revised Total Coliform Rule | Microbiological | 7 | No |
| Consumer Confidence Report Rule | Reporting Failure | 6 | No |
| Contaminant 1028 | Other Violation | 3 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 2 | Yes |
| Contaminant 2033 | Other Violation | 1 | No |
| Gross Beta | Radionuclides | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 60431 | 0.00703 mg/L | No | N/A |
| 60432 | 0.00703 mg/L | No | N/A |
| 60433 | 0.00703 mg/L | No | N/A |
| 60434 | 0.00703 mg/L | No | N/A |
| 60435 | 0.00703 mg/L | No | N/A |
| 60436 | 0.00703 mg/L | No | N/A |
| 60541 | 0.005 mg/L | No | N/A |
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: 16 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 60403 — Crest Hill
- 60404 — Shorewood
- 60410 — Channahon
- 60431 — Joliet
- 60432 — Joliet
- 60433 — Joliet
- 60434 — Joliet
- 60435 — Joliet
- 60436 — Joliet
- 60441 — Lockport
- 60447 — Minooka
- 60451 — New Lenox
- 60541 — Newark
- 60543 — Oswego
- 60544 — Plainfield
- 60560 — Yorkville
- 60586 — Plainfield
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Joliet (IL1970450) on EPA.gov.
Frequently Asked Questions
Is Joliet water safe to drink?
Joliet has recorded 7 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 Joliet serve?
Joliet serves approximately 160,000 people across 17 ZIP codes in Illinois.
Where does Joliet get its water?
The primary water source is groundwater.
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 →
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.
- #85 / 100 Highest Exposure Burden (U.S.)
- #2 / 50 Highest Exposure Burden (Illinois)
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
Joliet (EPA ID: IL1970450) — request the latest Consumer Confidence Report or ask about specific contaminants.