Is Gresham tap water safe to drink?

Yes with good quality

Gresham's tap water meets all EPA standards and scores well on our analysis. It is generally safe to drink though filtration can improve taste and provide extra precaution.

85/100
Purity Score
1
Issues Found
1 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Gresham

Arsenic Approaching Limit (0.1 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Gresham
Oregon

970,309,708,097,233 · Bull Run Watershed

Water Quality in Gresham, OR (2026)

Low Risk Updated March 2026 111,000 residents
See Best Filters for Gresham
85
Purity Score

Residents of Gresham draw from Bull Run Watershed infrastructure managed by Gresham Water Services. This 2026 analysis evaluates safety, identifies any concerns, and recommends the best home filtration options.

Contaminant Levels

PFAS
ND
Lead
1.2 ppb
Nitrate
0.3 mg/L
Arsenic
0.1 mg/L
Hardness
1 gpg

Health Insights

  • 1
    Gresham's water meets current EPA standards. Filtration can improve taste and provide extra safety.

Score

85 /100
Excellent
"Good" threshold (70)

Gresham tap water is sourced from Bull Run Watershed and treated by Gresham Water Services. Overall purity score: 85/100 (Excellent). Updated for 2026.

Fix Your Water

Best filters matched to Gresham's 1 issue.

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Gresham Water FAQ

Is Gresham OR tap water safe to drink in 2026?
Gresham tap water meets EPA federal drinking water standards and scores 85/100 (Excellent) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Gresham OR use chlorine or chloramine for disinfection?
Gresham uses chloramine as the primary disinfectant with a residual level of 0.8 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.
How hard is Gresham OR water and what is the TDS level?
Gresham water hardness is 1.0 grains per gallon (soft) with a TDS of 22 ppm (excellent). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Gresham OR drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Gresham drinking water.
What is the best water filter for Gresham?
Based on Gresham's water profile, we recommend the Clearly Filtered Water Pitcher. Gresham water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

PortlandOregon — 85/100EugeneOregon — 85/100SalemOregon — 85/100HillsboroOregon — 85/100BendOregon — 85/100MedfordOregon — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • Gresham Water Services CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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