Mo American St Louis St Charles Counties
EPA ID: MO6010716 · 1,111,000 people served · 65 ZIP codes
With 3 unresolved EPA violations, Mo American St Louis St Charles Counties is currently out of full compliance — approximately 1,111,000 people in its service area.
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 6 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Mo American St Louis St Charles Counties Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Mo American St Louis St Charles Counties serves a community with a median household income of $85,724 and an estimated 1,591,803 residents across its service area. Approximately 71% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Mo American St Louis St Charles Counties'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 St. Louis County, Missouri rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Mo American St Louis St Charles Counties compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 6 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Total Trihalomethanes (TTHM) at 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 56 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →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
Mo American St Louis St Charles Counties (EPA ID: MO6010716) is a community water system in Missouri that serves approximately 1,111,000 people from surface water sources.
This system provides water to 65 ZIP codes across 22 communities.
Average Home Safety Score: D (49/100)
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 |
|---|---|---|---|
| July 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Resolved |
| April 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Resolved |
| January 1, 2024 | Total Trihalomethanes (TTHM) | Health-based | Unresolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 6 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | Yes |
| Chlorine residual | Disinfectant | 1 | Yes |
Health Risk Details
Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)
Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.
Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →
Total Trihalomethanes (TTHM) (EPA limit: 0.08 mg/L)
Bladder & rectal cancer risk; reproductive concerns At-risk groups: pregnant women, long-term consumers of chlorinated water, people who frequently shower in chlorinated water.
Removal methods: granular activated carbon (GAC), carbon block filter, point-of-entry aeration. Find the right filter →
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:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 63005 | 0.001 mg/L | No | N/A |
| 63006 | 0.001 mg/L | No | N/A |
| 63017 | 0.001 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: 62 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 3 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 65 ZIP codes:
63005 · 63006 · 63010 · 63011 · 63012 63017 · 63021 · 63022 · 63024 · 63025 63026 · 63031 · 63033 · 63034 · 63038 63040 · 63042 · 63043 · 63044 · 63045 63049 · 63052 · 63069 · 63074 · 63088 63105 · 63109 · 63112 · 63114 · 63115 63116 · 63117 · 63119 · 63120 · 63121 63122 · 63123 · 63124 · 63125 · 63126 63127 · 63128 · 63129 · 63130 · 63131 63132 · 63133 · 63134 · 63135 · 63136 63137 · 63138 · 63139 · 63140 · 63141 63143 · 63144 · 63146 · 63147 · 63301 63303 · 63304 · 63366 · 63368 · 63376
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Mo American St Louis St Charles Counties (MO6010716) on EPA.gov.
Frequently Asked Questions
Is Mo American St Louis St Charles Counties water safe to drink?
Mo American St Louis St Charles Counties has recorded 8 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 Mo American St Louis St Charles Counties serve?
Mo American St Louis St Charles Counties serves approximately 1,111,000 people across 65 ZIP codes in Missouri.
Where does Mo American St Louis St Charles Counties get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
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.
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
Mo American St Louis St Charles Counties (EPA ID: MO6010716) — request the latest Consumer Confidence Report or ask about specific contaminants.