Lyon-sioux Rws-big Sioux
EPA ID: IA6000755 · 1,530 people served · 1 ZIP code
Federal monitoring records confirm Lyon-sioux Rws-big Sioux has operated without any EPA violations for the full five-year window — covering every contaminant category and reporting cycle across a service area of approximately 1,530 residents, with no gaps in the compliance record.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Lyon-sioux Rws-big Sioux Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Lyon-sioux Rws-big Sioux serves a community with a median household income of $69,320 and an estimated 4,075 residents across its service area. Approximately 75% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Lyon-sioux Rws-big Sioux'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 Lyon County, Iowa rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Iowa
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
Lyon-sioux Rws-big Sioux (EPA ID: IA6000755) is a community water system in Iowa that serves approximately 1,530 people from groundwater sources.
This system serves ZIP code 51246 in Rock Rapids.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 51246 — Rock Rapids
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Lyon-sioux Rws-big Sioux (IA6000755) on EPA.gov.
Frequently Asked Questions
Is Lyon-sioux Rws-big Sioux water safe to drink?
Based on EPA records, Lyon-sioux Rws-big Sioux has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Lyon-sioux Rws-big Sioux serve?
Lyon-sioux Rws-big Sioux serves approximately 1,530 people across 1 ZIP code in Iowa.
Where does Lyon-sioux Rws-big Sioux 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.