If you rely on a public water system in Guymon, Oklahoma, Nitrate is a contaminant your utility has been required to test for — and EPA records show it has been detected at measurable levels, making it worth understanding as part of your tap water's detection record.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

Nitrate in Guymon Tap Water

Nitrate has been detected in Guymon, Oklahoma drinking water at a maximum level of 8.9 ppb — below the EPA MCL of 10 mg/L (as nitrogen).

This analysis covers 11,442 residents across 1 ZIP code in Guymon.

Guymon's overall water quality grade is B (74/100).

Is Nitrate in Guymon Water Safe?

Nitrate was detected in Guymon water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.

If you are concerned, a reverse osmosis or ion exchange filter can reduce nitrate levels further.

Nitrate Levels by ZIP Code

Average nitrate level across Guymon: 8.9 ppb

Health Effects of Nitrate

• Methemoglobinemia ("blue baby syndrome") in infants under 6 months
• Increased risk of colorectal and bladder cancer (long-term)
• Thyroid disease from chronic exposure
• Possible reproductive effects

Health risk severity: High. Governed by the National Primary Drinking Water Regulations.

How Nitrate Gets Into Drinking Water

• Agricultural fertilizer runoff
• Animal feedlot operations and manure
• Septic system leachate
• Urban stormwater and wastewater discharge

What to Do About Nitrate in Guymon Water

1. Reverse osmosis is the most effective method for nitrate removal
2. Ion exchange systems designed for nitrate can also work
3. Standard carbon filters do NOT remove nitrate
4. Boiling water increases nitrate concentration — never boil for nitrate

Look for filters certified under NSF 53 / NSF 58 for nitrate removal.

Related

• Nitrate — National Overview
• Nitrate in Oklahoma
• Oklahoma Water Quality
• Guymon Water Quality
• Check Your ZIP Code