ZIP code areaZIP center Water utility service area PFOA/PFOS ≥ 4 ppt Lead > 15 ppb 5+ violations Superfund site (active) proposed cleaned up Circles: other water systems flagged nearby; size = people served. Tap any symbol for details.

Drinking water: probably a private well

No community water system’s service area covers the center of ZIP 63674, and no system lists it. In rural areas that usually means private wells. The EPA does not regulate private wells: owners should test once a year for coliform bacteria and nitrate, and every few years for arsenic, lead, uranium and other local concerns. Your county health department can recommend a certified lab.

Radon in Washington County

EPA radon zone 2 — moderate potential. Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.

Radon is a colorless, odorless radioactive gas from soil and rock, and the leading cause of lung cancer among non-smokers. EPA recommends fixing a home at 4 pCi/L or above and considering it from 2 pCi/L. A short-term test kit costs about $15–30. How radon zones work →

Natural hazard risk

FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Moderate, with relatively moderate social vulnerability and very low community resilience.

Cold waveVery High

Heat waveVery High

Strong windRelatively High

TornadoRelatively High

EarthquakeRelatively Moderate

HailRelatively Moderate

Ice stormRelatively Moderate

LightningRelatively Moderate

Winter weatherRelatively Moderate

Riverine floodingRelatively Low

WildfireRelatively Low

HurricaneVery Low

LandslideVery Low

FEMA National Risk Index (December 2025): expected annual losses from each hazard combined with social vulnerability and community resilience, rated relative to all U.S. census tracts. Hazards not listed are not applicable here. It describes the area, not a single building; flood insurance maps (FEMA FIRMs) decide flood-insurance requirements.

Live conditions: river gauges and flood levels · tornado warnings · wildfire detections · earthquakes — our sister maps, updated from NOAA, USGS and NASA every few minutes.

Superfund sites nearby

Site	Status	Distance
Washington County Lead District - Old Mines Old Mines, Missouri · EPA ID MON000705027	Active (final NPL)	5.1 mi
Washington County Lead District - Potosi Potosi, Missouri · EPA ID MON000705023	Active (final NPL)	9.1 mi

EPA Superfund National Priorities List (NPL): the country’s most serious known hazardous-waste sites, each with an EPA cleanup record (linked). Distance is measured from the ZIP center to the site’s reference point; being near a site does not by itself mean exposure — EPA site pages describe what was found and how it is being cleaned up.

Buying a home in Tiff? See the 2026 conforming, FHA and jumbo loan limits for Washington County →

What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.

Questions about 63674

Does ZIP 63674 have public water?

No community water system service area covers the center of ZIP 63674, and none lists it. Homes here most likely use private wells, which no agency tests — owners should test yearly for bacteria and nitrate, and every few years for arsenic, lead and other local concerns.

What natural hazards affect ZIP 63674?

FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Moderate; the highest-rated hazards are cold wave (very high), heat wave (very high), strong wind (relatively high).

Are there Superfund sites near 63674?

The nearest active Superfund site is 5.1 miles away. Sites within 10 miles: Washington County Lead District - Old Mines (5.1 mi, Active (final NPL)); Washington County Lead District - Potosi (9.1 mi, Active (final NPL)).

Is radon a problem in Washington County?

Washington County is in EPA radon zone 2 (moderate potential). Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.