Siloam Springs Waterworks
EPA ID: AR0000056 · 21,430 people served · 2 ZIP codes
Current EPA status: Siloam Springs Waterworks, 22 open violations, 21,430 people 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 10 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Siloam Springs Waterworks Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Siloam Springs Waterworks serves a community with a median household income of $69,168 and an estimated 32,088 residents across its service area. Approximately 43% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Siloam Springs Waterworks's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Benton County, Arkansas rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Siloam Springs Waterworks compares to EPA limits
What This Means For You
Consumer Confidence Report Rule at 9 mg/L exceeds the EPA maximum of mg/L.
Chlorine residual at 30 mg/L (MRDL — Maximum Residual Disinfectant Level) exceeds the EPA maximum of 4 mg/L (MRDL — Maximum Residual Disinfectant Level). Irritation & DBP formation at high levels; protective at normal treatment levels. Consider granular activated carbon (GAC) filtration.
Lead and Copper Rule at 6 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 6 detections recorded.
Chlorine residual was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Arkansas
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
Siloam Springs Waterworks (EPA ID: AR0000056) is a community water system in Arkansas that serves approximately 21,430 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: D (48/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| July 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| July 1, 2025 | Chlorine residual | Health-based | Unresolved |
| June 1, 2025 | Chlorine residual | Health-based | Unresolved |
| May 1, 2025 | Chlorine residual | Health-based | Unresolved |
| April 1, 2025 | Chlorine residual | Health-based | Unresolved |
| March 1, 2025 | Chlorine residual | Health-based | Unresolved |
| February 1, 2025 | Chlorine residual | Health-based | Unresolved |
| January 1, 2025 | Chlorine residual | Health-based | Unresolved |
| December 1, 2024 | Chlorine residual | Health-based | Unresolved |
| November 1, 2024 | Chlorine residual | Health-based | Unresolved |
| October 1, 2024 | Chlorine residual | Health-based | Unresolved |
| October 1, 2024 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| September 1, 2024 | Chlorine residual | Health-based | Unresolved |
| August 1, 2024 | Chlorine residual | Health-based | Unresolved |
| July 1, 2024 | Chlorine residual | Health-based | Unresolved |
| May 1, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| December 1, 2023 | Total Coliform | Monitoring | Unresolved |
| July 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| April 1, 2023 | Chlorine residual | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Chlorine residual | Disinfectant | 30 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 9 | No |
| Lead and Copper Rule | Treatment Failure | 6 | No |
| Total Coliform | Microbiological | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| E. coli | Microbiological | 1 | Yes |
Health Risk Details
Chlorine (Residual Disinfectant) (EPA limit: 4 mg/L (MRDL — Maximum Residual Disinfectant Level))
Irritation & DBP formation at high levels; protective at normal treatment levels At-risk groups: people with asthma or chemical sensitivities, kidney dialysis patients (water must be dechlorinated).
Removal methods: granular activated carbon (GAC), KDF media filter, carbon block filter. Find the right filter →
E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))
Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.
Removal methods: UV disinfection (99.99%), chlorination, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 72761 | 0.001 mg/L | No | N/A |
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 AR or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Siloam Springs Waterworks (AR0000056) on EPA.gov.
Frequently Asked Questions
Is Siloam Springs Waterworks water safe to drink?
Siloam Springs Waterworks has recorded 31 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Siloam Springs Waterworks serve?
Siloam Springs Waterworks serves approximately 21,430 people across 2 ZIP codes in Arkansas.
Where does Siloam Springs Waterworks get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
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.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
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
Siloam Springs Waterworks (EPA ID: AR0000056) — request the latest Consumer Confidence Report or ask about specific contaminants.