Jefferson City, MO Water Safety: 81/100 (2026)
11 ZIP codes · 7 water systems · Updated 2026-06-03
Throughout Jefferson City and across its water systems, EPA compliance data for MO shows above-average performance — violations are minimal, none of the tracked systems have recorded repeated MCL exceedances in recent cycles, and the safety picture has held steady across multiple reporting periods.
How Jefferson City Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Jefferson City, MO
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Jefferson City.
Jefferson City Water: The Quick Version
- Average lead level: 0.002 mg/L.
- Estimated remediation: $1,055 per household.
- CDC health risk index: 13.2 — above typical levels.
Water Systems Serving Jefferson City
Throughout Jefferson City, MO, water comes from one of 3 primary utilities out of 7 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 11 ZIP codes in Jefferson City, Missouri, covering 7 community water systems serving approximately 70,167 people.
No EPA violations recorded across any ZIP codes in Jefferson City — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Jefferson City: B (81/100)
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
Jefferson City water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0020 mg/L (EPA action level: 0.015 mg/L)
- 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): 11 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 |
|---|---|---|---|
| 65101 | C | Mo American Jefferson City District | 30,075 |
| 65102 | B | Mo American Jefferson City District | 30,075 |
| 65103 | B | Mo American Jefferson City District | 30,075 |
| 65104 | B | Mo American Jefferson City District | 30,075 |
| 65105 | B | Mo American Jefferson City District | 30,075 |
| 65106 | B | Mo American Jefferson City District | 30,075 |
| 65107 | B | Mo American Jefferson City District | 30,075 |
| 65108 | B | Mo American Jefferson City District | 30,075 |
| 65109 | B | Mo American Jefferson City District | 30,075 |
| 65110 | B | Mo American Jefferson City District | 30,075 |
All ZIP Codes in Jefferson City
- 65101 [C]
- 65102 [B]
- 65103 [B]
- 65104 [B]
- 65105 [B]
- 65106 [B]
- 65107 [B]
- 65108 [B]
- 65109 [B]
- 65110 [B]
- 65111 [B]
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.
CDC Health Data for Jefferson City
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
Jefferson City: Remediation Cost in Perspective
The household financial picture for Jefferson City homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Jefferson City are relatively low compared to home values. The $436–$1,755 estimated range is a small fraction of median property value. Home values are 34% above the Missouri average.
Protecting Children from Lead in Jefferson City
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.
Lead risk in Jefferson City appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Jefferson City
45% of ZIP codes in Jefferson City are mapped into FEMA-designated flood zones, and the NFIP records 455 claims reflecting a multi-event flood history. That combination places local flood exposure in the range where water-quality implications deserve at least periodic attention.
Jefferson City has a moderate flood history with 455 FEMA claims averaging $15,267 per payout. 45% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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>$1,055</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.
Deep Dive Reports
Detailed analysis for Jefferson City, MO