Grandfield Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,110 residents · Oklahoma
What's In Grandfield's Tap Water?
1
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
27
Violations (last 5yr)
14
Unresolved
22
Health-Related
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: July 1, 2025 – September 30, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: April 1, 2025 – June 30, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: January 1, 2025 – March 31, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: October 1, 2024 – December 31, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: July 1, 2024 – September 30, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (single sample)
When: April 1, 2024 – June 30, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2024 – March 31, 2024Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 30, 2023 – March 19, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: September 29, 2023 – March 19, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 30, 2023 – September 14, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2023 – July 3, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2023 – June 30, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: April 1, 2023 – June 30, 2023Enforcement: Formal — state order issued
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: January 1, 2023 – March 31, 2023Enforcement: Formal — state order issued
TIER 3Resolved
Failed to conduct Level 2 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 30, 2022 – July 3, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2022 – December 31, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: October 1, 2022 – December 31, 2022Enforcement: Formal — state order issued
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2022 – September 30, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: July 1, 2022 – September 30, 2022Enforcement: Formal — state order issued
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: April 1, 2022 – June 30, 2022Enforcement: Formal — state order issued
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2022 – March 31, 2022Rule: Stage 2 DBPREnforcement: Formal — state order issuedVerify on EPA.gov
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: January 1, 2022 – March 31, 2022Enforcement: Formal — state order issued
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: October 1, 2021 – December 31, 2021Enforcement: Formal — state order issued
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: July 1, 2021 – September 30, 2021Enforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Grandfield, Oklahoma tap water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 212 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Grandfield's water?
1 contaminants were tested in Grandfield's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Grandfield have any water quality violations?
Yes, Grandfield has 212 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, MR. 151 of these are health-based violations, which are the most serious category.
Do I need a water filter in Grandfield?
Grandfield water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Grandfield's tap water come from?
Grandfield's drinking water is sourced from purchased surface water and supplied by GRANDFIELD. The system serves approximately 1,110 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Grandfield's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Grandfield's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Grandfield's water compare to other cities in Oklahoma?
Grandfield's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Oklahoma state page to see how all cities in the state compare.
What should I do if I'm concerned about Grandfield's water quality?
If you have concerns about Grandfield's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (GRANDFIELD) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.