Honolulu Tap Water Quality Report
Honolulu's water has 2 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
Utility
HONOLULU WATER SYSTEM
People Served
631,389
MCL Violations
0
Last Updated
Is Honolulu Tap Water Safe to Drink?
Honolulu's water has 2 contaminants above EPA health-based guidelines (MCLGs). While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
The data below shows test results from HONOLULU WATER SYSTEM, which serves 631,389 people in the Honolulu area. Water quality testing is conducted regularly and reported to the EPA. This report was last updated May 21, 2025.
Honolulu Water Quality Test Results
Key Water Quality Metrics
Contaminants Detected
⚠️ Contaminants Above EPA MCLG (2)
Bis(2-ethylhexyl) phthalate
What is Bis(2-ethylhexyl) phthalate?
Member of a family of synthetic compounds called phthalates that are added to polyvinyl chloride (PVC), a chemical used to improve flexibility and durability in consumer products
Health Effects
Drinking water standards for DEHP are based on potential liver toxicity and endocrine effects (impacting development and the male reproductive system), as well as an increased risk of cancer. The EPA classifies DEHP as a probable human carcinogen.
Affected Organs
Common Sources
Perfluorooctanoic acid
What is Perfluorooctanoic acid?
Perfluorooctanoic acid (PFOA) is a synthetic chemical that belongs to a group of chemicals known as per- and polyfluoroalkyl substances (PFAS). It is used in various industrial applications and consumer products for its water- and grease-resistant properties.
Health Effects
Exposure to PFOA has been linked to several health issues, including developmental effects in fetuses, increased cholesterol levels, liver damage, thyroid disease, and certain types of cancer.
Affected Organs
Common Sources
Understanding the Data
This data comes from your local water utility testing. The bar charts compare detected levels against EPA's Maximum Contaminant Level Goal (MCLG). Contaminants above the MCLG are shown by default and may require filtration. All other tested contaminants are within safe levels and can be viewed by expanding the section above.
Recommended Water Filters for Honolulu
Based on Honolulu's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
1,2 Dichlorobenzene, 1,4 Dichlorobenzene, 2,4-D, Asbestos, Atrazine +14 more
Whirlpool Corporation
W11569861
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.52 gpm
Removes 22 contaminants:
1,2 Dichlorobenzene, 1,2,4 Trichlorobenzene, 1,4 Dichlorobenzene, 2,4-D, Asbestos +17 more
iSpring Water Systems LLC
RCC7
NSF Certified:
Daily Production
21.04 gpd
Removes 1 contaminants:
Total Dissolved Solids
iSpring Water Systems LLC
RCC7-BLK
NSF Certified:
Daily Production
25.41 gpd
Removes 9 contaminants:
Asbestos, Barium, Cadmium, Chromium (Total), Copper +4 more
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Standard Home Water Test
$232
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
SimpleLab
Advanced Home Water Test
$369
Most comprehensive home water test including all standard tests plus additional parameters for ultimate peace of mind.
Tap Score
PFAS Forever Chemicals Test
$239
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
Frequently Asked Questions About Honolulu Tap Water
Honolulu's water has 2 contaminants above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.