Water Quality in Grandfield, OK: 32 Violations — Grade C
Grade C · Score 55/100 · 1 water system · Updated 2026-05-03
Grandfield's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
According to EPA filings, Grandfield, OK has 32 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 Grandfield
Water quality varies across Grandfield's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 73546 | C | 55 | 32 | 26 | View report → |
Violation Trend
EPA violations recorded for water systems serving Grandfield.
Water Quality Overview
Grandfield, Oklahoma receives a water quality grade of C with an overall score of 55 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Grandfield have accumulated 32 EPA violations, including 26 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 1,110 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Grandfield's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for Grandfield is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 72% of homes built before 1986, Grandfield 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.
Water Systems Serving Grandfield
Grandfield is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 1,110 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 Grandfield. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Grandfield
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 Grandfield Water Systems
The following contaminants have been detected or caused violations across Grandfield's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Arsenic | Inorganic | 0.01 mg/L | 16 | 1 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 15 | 1 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Grandfield:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2022 | 2 | 2 |
| 2023 | 6 | 6 |
| 2024 | 4 | 4 |
| 2025 | 3 | 3 |
Violations have increased from 2 in 2022 to 3 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Grandfield. Recent actions:
| Date | Action Type |
|---|---|
| 2025-08-26 | State Informal Action |
| 2025-08-26 | State Informal Enforcement |
| 2025-08-22 | State Informal Action |
| 2025-06-18 | State Order Action |
| 2025-05-27 | State Informal Action |
| 2025-05-27 | State Informal Enforcement |
| 2025-05-23 | State Informal Action |
| 2025-04-25 | State Informal Action |
| 2025-03-06 | State Informal Action |
| 2025-03-06 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-08-26.
Grandfield vs. Nearby Oklahoma Cities
How Grandfield's water quality compares to similar cities in Oklahoma:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Grandfield | C | 32 | 1 | 1,110 |
| Foster | B | 0 | 1 | 1,107 |
| Bluejacket | C | 0 | 1 | 1,100 |
| Laverne | A | 12 | 1 | 1,097 |
Common Questions About Grandfield Water
These are the most common questions residents search for about water quality in Grandfield, Oklahoma:
Is Grandfield water hard or soft? Water hardness varies by source. Grandfield's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Grandfield tap water? Grandfield's water receives a grade of C (55/100). There are 26 health-based violations — consider filtration.
What is the best water filter for Grandfield? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Grandfield vs. Oklahoma Average
Understanding how Grandfield compares to the broader Oklahoma 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 Grandfield.
ZIP Codes in Grandfield
Grandfield spans 1 ZIP code. The ZIP with the lowest water quality score is 73546. 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.