Water Quality in Arrow Rock, MO: 9 Violations — Grade B
Grade B · Score 77/100 · 1 water system · Updated 2026-05-03
Arrow Rock's water is mostly safe. Minor violations exist but are primarily monitoring-related.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
According to EPA filings, Arrow Rock, MO has 9 water compliance violations on record — sourced from SDWIS, the federal database that tracks reportable events for every registered public water system in the state.
Water Quality by ZIP Code in Arrow Rock
Water quality varies across Arrow Rock's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 65320 | B | 77 | 9 | 2 | View report → |
Water Quality Overview
Arrow Rock, Missouri receives a water quality grade of B with an overall score of 77 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Arrow Rock have accumulated 9 EPA violations, including 2 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 235 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Arrow Rock's water systems meet the vast majority of federal requirements. Minor violations may exist but typically relate to monitoring or reporting rather than health-based standards.
Lead Levels
The average 90th percentile lead level across Arrow Rock water systems is 0.0017 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 87% of homes built before 1986, Arrow Rock has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Arrow Rock is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Arrow Rock
Arrow Rock is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 235 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Arrow Rock. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Arrow Rock
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Arrow Rock Water Systems
The following contaminants have been detected or caused violations across Arrow Rock's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 3 | 1 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 2 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Arrow Rock. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-22 | State Order Extension |
| 2025-06-06 | State Informal Action |
| 2025-05-23 | State Informal Action |
| 2025-05-23 | State Informal Enforcement |
| 2025-05-23 | State Filed Judgment |
| 2025-05-07 | State Order Extension |
| 2025-01-27 | State Informal Action |
| 2025-01-17 | State Informal Action |
| 2025-01-08 | State Informal Action |
| 2025-01-08 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-22.
Arrow Rock vs. Nearby Missouri Cities
How Arrow Rock's water quality compares to similar cities in Missouri:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Arrow Rock | B | 9 | 1 | 235 |
| Ridgedale | B | 3 | 2 | 235 |
| Sheridan | B | 1 | 1 | 235 |
| Amazonia | C | 1 | 1 | 236 |
Common Questions About Arrow Rock Water
These are the most common questions residents search for about water quality in Arrow Rock, Missouri:
Is Arrow Rock water hard or soft? Water hardness varies by source. Arrow Rock's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Arrow Rock tap water? Arrow Rock's water receives a grade of B (77/100). There are 2 health-based violations — consider filtration.
What is the best water filter for Arrow Rock? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Arrow Rock vs. Missouri Average
Understanding how Arrow Rock compares to the broader Missouri average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Arrow Rock.
ZIP Codes in Arrow Rock
Arrow Rock spans 1 ZIP code. The ZIP with the lowest water quality score is 65320. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
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
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade B is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.