Nitrate + Nitrite above the legal limit in the period starting January 2026.
Serves about 1,110 people (595 connections) with surface water bought from Frederick.
From EPA's record for OK2007103. PurityMap is independent of Grandfield.
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61 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From January 2026 | Nitrate + Nitrite | 12 mg/L | – | Archived |
| From October 2025 | Nitrate + Nitrite | 12 mg/L | – | Archived |
| From July 2025 | Nitrate + Nitrite | 12 mg/L | – | Archived |
| From April 2025 | Nitrate + Nitrite | 12 mg/L | – | Archived |
| From January 2025 | Nitrate + Nitrite | 14 mg/L | – | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Nitrate + Nitrite | 11 mg/L | – | Archived |
| From July 2024 | Nitrate + Nitrite | 13 mg/L | – | Archived |
| From April 2024 | Nitrate + Nitrite | 11 mg/L | – | Archived |
| Jan–Mar 2024 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2023 | Total trihalomethanes (TTHM) | 0.113 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2023 | Total trihalomethanes (TTHM) | 0.135 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2023 | Total trihalomethanes (TTHM) | 0.151 mg/L | 0.080 mg/L | Archived |
| From April 2023 | Nitrate + Nitrite | 13 mg/L | – | Resolved |
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 0.128 mg/L | 0.080 mg/L | Archived |
| From January 2023 | Nitrate + Nitrite | 16 mg/L | – | Resolved |
| Oct–Dec 2022 | Total trihalomethanes (TTHM) | 0.122 mg/L | 0.080 mg/L | Archived |
| From October 2022 | Nitrate + Nitrite | 13 mg/L | – | Resolved |
| Jul–Sep 2022 | Total trihalomethanes (TTHM) | 0.117 mg/L | 0.080 mg/L | Archived |
| From July 2022 | Nitrate + Nitrite | 14 mg/L | – | Resolved |
| From April 2022 | Nitrate + Nitrite | 16 mg/L | – | Resolved |
| Jan–Mar 2022 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Archived |
| From January 2022 | Nitrate + Nitrite | 16 mg/L | – | Resolved |
| From October 2021 | Nitrate + Nitrite | 13 mg/L | – | Resolved |
| From July 2021 | Nitrate + Nitrite | 15 mg/L | – | Resolved |
| Apr–Jun 2021 | Total trihalomethanes (TTHM) | 0.088 mg/L | 0.080 mg/L | Archived |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →Grandfield's phone number on EPA record is 580-479-5215. Its mailing address is The Honorable Paula Schoonover, Mayor, P.O. BOX 360, GRANDFIELD, OK 73546.
According to EPA's record, Grandfield uses surface water bought from Frederick.
EPA's record shows 61 health-based violations for Grandfield in the 10 years to July 9, 2026. Nitrate + Nitrite was above the legal limit in the period starting January 2026. EPA also lists 5 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Grandfield's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Grandfield. Its phone number on EPA record is 580-479-5215. Its mailing address on EPA record is The Honorable Paula Schoonover, Mayor, P.O. BOX 360, GRANDFIELD, OK 73546. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.