Water Quality in Honolulu, HI
Honolulu's water quality meets all health guidelines. All tested contaminants are within safe levels.
Utility
HONOLULU WATER SYSTEM
People Served
631,389
MCL Violations
0
Last Updated
May 21, 2025
Quick Summary
Contaminants Detected
Understanding the Data
This data comes from your local water utility testing. The bar charts compare detected levels against health guidelines (HGL). Contaminants above the health guideline 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 health guidelines.
![CB-AS[2] CB-AS[2]](/_next/image?url=https%3A%2F%2Fm.media-amazon.com%2Fimages%2FI%2F61gNx3gE9pL._SX425_.jpg&w=3840&q=75)
Carbon Block Technology
CB-AS[2] CB-AS[2]
NSF Certified:
Capacity
600 gal
Filter Life
2 mo
Flow Rate
1 gpm
Removes 10 contaminants:
Arsenic, Asbestos, Cryptosporidium, Lead, Mercury +5 more
Omnipure Filter Co.
ELF ELF 1MPF
NSF Certified:
Capacity
500 gal
Filter Life
2 mo
Flow Rate
1.67 gpm
Removes 6 contaminants:
Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Cryptosporidium, Perfluorooctanesulfonic acid +1 more
![RWP50020BWW[3] RWP50020BWW[3]](/_next/image?url=https%3A%2F%2Fm.media-amazon.com%2Fimages%2FI%2F41p7zRQewWL._AC_SX679_.jpg&w=3840&q=75)
Samsung Electronics Co., Ltd.
RWP50020BWW[3] RWP50020BWW[3]
NSF Certified:
Capacity
330 gal
Filter Life
1 mo
Flow Rate
0.45 gpm
Removes 14 contaminants:
Asbestos, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chromium (Total) +9 more
Samsung Electronics Co., Ltd.
RWP70a15def[1] RWP70a15def[1]
NSF Certified:
Capacity
330 gal
Filter Life
1 mo
Flow Rate
0.45 gpm
Removes 14 contaminants:
Asbestos, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chromium (Total) +9 more
Frequently Asked Questions
Honolulu's tap water currently meets all health guidelines. All 20 contaminants tested are within safe levels according to health-based guidelines. The water is considered safe to drink, though some people may still prefer filtered water for taste or extra protection.