Florissant, MO Water Safety: 53/100 (2026)
4 ZIP codes · 3 water systems · Updated 2026-06-03
Monitoring data across Florissant reveals a persistent pattern of below-average compliance in MO — multiple service areas carry documented health violations, and the data has shown little overall improvement over recent EPA reporting cycles.
How Florissant Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Florissant Residents
- Homes built before 1986: 75% — older plumbing may contain lead solder.
- Estimated remediation: $2,100 per household.
- CDC health risk index: 12.49 — above typical levels.
Florissant's Water Providers
Florissant, MO is covered by 3 major water utilities out of 3 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
Overview
We track water quality and home safety data for 4 ZIP codes in Florissant, Missouri (population ~112,073), covering 3 community water systems serving approximately 1,111,465 people region-wide.
No EPA violations recorded across any ZIP codes in Florissant — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Florissant: D (53/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Florissant water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Florissant
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 4 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 63031 | D | Mo American St Louis St Charles Counties | 1,111,000 |
| 63032 | C | FRONTIER ESTATES | 120 |
| 63033 | D | Mo American St Louis St Charles Counties | 1,111,000 |
| 63034 | C | Mo American St Louis St Charles Counties | 1,111,000 |
All ZIP Codes in Florissant
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
Updated daily.
Florissant Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Florissant Infrastructure Age
With 75% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
When more than half a city's housing predates the 1986 federal ban on lead solder, plumbing-era lead risk becomes a citywide concern rather than an exception. Florissant's median build year of 1970 places it squarely in that category.
Over half of homes in Florissant were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Florissant
Property value and cost data for Florissant produce a moderate remediation-share classification — a level where advance financial planning has real practical value and the commitment is realistic for most homeowners who approach it deliberately.
Remediation costs are moderate relative to home values in Florissant. The estimated $1,100–$3,400 range is manageable for most homeowners but still worth budgeting for. Home values are 10% below the Missouri average.
Florissant: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Older stock in Florissant represents 75% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Florissant: Flood History & Water Damage Risk
Flood risk in Florissant reaches a level where its interaction with water quality becomes a concrete planning concern rather than an abstract possibility. NFIP data records 551 claims, and 100% of the area's ZIP codes are within FEMA-designated flood zones. At this exposure level, the mechanisms connecting major flood events to water quality disruption — treatment overload, well contamination, distribution backflow — have likely been activated repeatedly over the multi-decade NFIP tracking window.
Florissant has a significant flood history with 551 FEMA flood insurance claims on record, averaging $12,491 per claim. With 100% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
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. Flood damage can add significantly to the estimated <strong>$2,100</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Florissant
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 75% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Florissant, MO