Because Nitrate is associated with health effects at sustained elevated exposures, residents in Warwick, Massachusetts may find it useful that local water systems have returned detectable concentrations — facts that bear on long-term household water decisions.

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

Nitrate in Warwick Tap Water

Nitrate has been detected in Warwick, Massachusetts drinking water at a maximum level of 7 ppb — below the EPA MCL of 10 mg/L (as nitrogen).

This analysis covers 6,526 residents across 1 ZIP code in Warwick.

Warwick's overall water quality grade is D (53/100).

Is Nitrate in Warwick Water Safe?

Nitrate was detected in Warwick 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 Warwick: 7 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 Warwick 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 Massachusetts
• Massachusetts Water Quality
• Warwick Water Quality
• Check Your ZIP Code