Johnson County Pwsd 3
EPA ID: MO1024311 · 4,700 people served · 9 ZIP codes
Five clean years on EPA record — Johnson County Pwsd 3, 4,700 residents served.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2021) to 1 (2022). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Johnson County Pwsd 3 Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Johnson County Pwsd 3 serves a community with a median household income of $67,500 and an estimated 57,240 residents across its service area. Approximately 47% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Johnson County Pwsd 3's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Johnson County, Missouri rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 62th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Missouri
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
Johnson County Pwsd 3 (EPA ID: MO1024311) is a community water system in Missouri that serves approximately 4,700 people from groundwater sources.
This system provides water to 9 ZIP codes across 9 communities.
Average Home Safety Score: D (53/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by MO or modeled from parcel and building-footprint data.
- 64019 — Centerview
- 64040 — Holden
- 64093 — Warrensburg
- 64733 — Chilhowee
- 64747 — Garden City
- 64761 — Leeton
- 65305 — Whiteman Air Force Base
- 65336 — Knob Noster
- 65360 — Windsor
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Johnson County Pwsd 3 (MO1024311) on EPA.gov.
Frequently Asked Questions
Is Johnson County Pwsd 3 water safe to drink?
Based on EPA records, Johnson County Pwsd 3 has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Johnson County Pwsd 3 serve?
Johnson County Pwsd 3 serves approximately 4,700 people across 9 ZIP codes in Missouri.
Where does Johnson County Pwsd 3 get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
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
Johnson County Pwsd 3 (EPA ID: MO1024311) — request the latest Consumer Confidence Report or ask about specific contaminants.