Lake Saint Louis, MO: 3 Violations - Home Safety 81/100
1 ZIP code · 2 water systems · Updated
ZipCheckup grade for Lake Saint Louis: B.
This ZIP has a few items worth a quick check.
In the dataset behind this page, Lake Saint Louis, MO receives one of the two highest grades; read the compliance history system by system for details.
How Lake Saint Louis Compares
Data: EPA SDWIS
What You Should Know About Lake Saint Louis Water
- Your city's water systems recorded 3 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0048 mg/L.
- Homes built before 1986: 24% - older plumbing may contain lead solder.
- Health risk index (ZipCheckup composite of CDC data): 11.99.
Who Supplies Your Water in Lake Saint Louis
Sorted by reported population served, the top 2 of 2 public water systems mapped to Lake Saint Louis, MO appear below, each with its own federal compliance record.
- B
- B
Overview
We track home safety data for 1 ZIP code in Lake Saint Louis, Missouri (population ~27,893), covering 2 community water systems serving approximately 142,371 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Lake Saint Louis: B (81/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Lake Saint Louis water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0048 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
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.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead and Copper Rule Revisions | Treatment Technique | 2 | 1 |
| Revised Total Coliform Rule | Microbiological | 2 | 1 |
| Groundwater Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 63367 | B | 3 | 0 | St Charles County Pwsd 2 |
All ZIP Codes in Lake Saint Louis
- 63367 [B] - 3 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Lake Saint Louis
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Lake Saint Louis Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Lake Saint Louis
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Federal restrictions on lead pipe, solder and flux in new drinking water plumbing date from the 1986 Safe Drinking Water Act amendments; the median build year of 2007 for Lake Saint Louis is one reference point against that date.
Most homes in Lake Saint Louis were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Lead Exposure Risk for Children in Lake Saint Louis
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
No safe blood lead level in children has been identified, according to CDC, so an area average under 0.010 mg/L does not rule out exposure at home. In Lake Saint Louis, 24% of homes were built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Lake Saint Louis
Historical NFIP data for Lake Saint Louis contains 14 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $4,675. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for Lake Saint Louis, MO