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Official EPA SDWIS Verified ReportWater Quality & Testing GuideHistorical Record: No Recorded SDWIS Violations

ZIP Code 96804 Water Quality & Testing Report

Honolulu, HI · Honolulu County County · Updated for 2026

Public Health & Medical Notice: Drinking water quality data on this page reflects historical compliance records submitted under the Safe Drinking Water Act. This information does not constitute medical advice or a real-time safety guarantee. If you are pregnant, nursing, preparing infant formula, or immunocompromised, consult a healthcare provider. Boiling water kills biological pathogens, but does NOT remove chemical contaminants like lead, arsenic, or PFAS.
Quick EPA Verified Answer

Is Tap Water Safe to Drink in ZIP 96804 (Honolulu, HI)?

Yes, tap water in ZIP code 96804 (Honolulu, HI) is safe to drink under EPA Safe Drinking Water Act standards. Supplied by Hnl-windward-pearl Harbor, the area earns an EPA Safety Grade of A (87/100) with 0 health violations, 0 ppb lead, and moderately hard (112 mg/L / 6.5 GPG) water.

Safety Score
A

Water Safety Grade

Excellent — Meets all EPA standards

Health Violations

0

Total Violations

0

Lead Risk

N/A

Contaminants

0

About Tap Water in ZIP Code 96804

Tap water in ZIP code 96804 (Honolulu, HI) is distributed by Hnl-windward-pearl Harbor (EPA ID: HI0000331), serving approximately 631,389 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of A with a composite quality score of 87/100.

Water System

Hnl-windward-pearl Harbor

EPA ID: HI0000331

Water Source

Ground Water

Population Served

631,389 residents

County

Honolulu County County, Hawaii

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Lead Levels in ZIP 96804

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Data Not Available

Lead testing data was not found in EPA records for ZIP code 96804. Contact Hnl-windward-pearl Harbor to request lead testing results.
Lead Exposure Risk Rating
Unknown
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Water Hardness & Mineral Content

Grains per gallon (GPG) & Parts per million (PPM / mg/L)

Classification: Moderately Hard6.5 GPG · 112 mg/L

Water in ZIP 96804 is Moderately Hard (112 mg/L / 6.5 GPG). It contains beneficial natural minerals like calcium and magnesium without causing heavy scale accumulation.

Recommendation: A water softener is optional. Regular maintenance of hot water appliances is recommended.
Hardness (GPG)

Grains per gallon

6.5 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

112 mg/L
Appliance Scaling Risk
Low / Moderate

Official EPA SDWIS Database Entry

Utility: Hnl-windward-pearl Harbor · PWSID: HI0000331

Verify on EPA.gov
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Violation History

Past 5 years — EPA SDWIS data

Hnl-windward-pearl Harbor has recorded zero violations in the EPA compliance database over the past 5 years.

Total Violations (5 yr)
0
Health-Based Violations
0
Unresolved Violations
0
Boil Water Advisories
0
Compliance Risk
Low

Regulatory compliance risk for this utility is rated Low based on past reporting and enforcement records.

⚗️

Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 96804 under the Safe Drinking Water Act.

⚖ Enforcement Actions

EPA or state regulators have issued 3 enforcement actions to address compliance lapses.
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Water Source & Environmental Factors

Ground Water

This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.

Water Source Type
Ground Water
CCR Source Classification
Groundwater wells (aquifers from volcanic rock filtration)
EPA Radon Zone

Lower potential

Zone 3

EPA Radon Zone 3 — lower radon potential, though the EPA still recommends testing all homes.

Water Quality Testing in ZIP 96804

Tap Water & Well Testing Recommendations

Residents in ZIP code 96804 served by Hnl-windward-pearl Harbor can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.

Tap Water Testing Steps

  • 1.Conduct a certified lead check if your home was constructed before 1986.
  • 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
  • 3.Sample water from both your kitchen faucet and water heater to compare line purity.

Private Well Testing Steps

  • •Test for Coliform bacteria and Nitrates annually.
  • •Test for heavy metals, radon, and PFAS every 3 years.
  • •Send samples to a state-certified drinking water laboratory recognized by Hawaii Department of Health.
Certified Lab Testing: Always use an EPA-certified drinking water laboratory in HI for formal legal or real estate compliance testing.

🛡 What Should You Do? — ZIP 96804 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from Hnl-windward-pearl Harbor
  • ✓ If your home was built before 1986, consider testing your own tap for lead
  • ✓ Use a pitcher filter (NSF/ANSI 42 certified) for improved taste

Recommended Taste & Safety Filter:

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NSF/ANSI 53 Certified Pitcher Filter

Best for removing aesthetic chlorine, odors, and low-level heavy metals.

Filter Selection Guide →

Frequently Asked Questions — ZIP 96804 Water Quality

Is tap water safe to drink in ZIP code 96804?+
Yes — tap water in 96804 (Honolulu, HI) meets EPA standards with a water safety grade of A. No health-based violations are on record in the past 5 years.
How do I get my water tested in ZIP 96804 (Honolulu, HI)?+
To test water quality in ZIP 96804, you can order a certified drinking water test kit or send water samples to an EPA/NELAP certified laboratory in HI. Certified testing checks for lead, coliform bacteria, nitrates, hardness, and PFAS that standard test strips miss. Contact Hawaii Department of Health for a list of certified regional labs.
How hard is the tap water in 96804?+
Tap water in 96804 is classified as Moderately Hard with an estimated mineral hardness of 112 mg/L (6.5 GPG). A water softener is optional. Regular maintenance of hot water appliances is recommended.
Should I test private well water in 96804?+
Yes. Unlike municipal systems, private wells in 96804 are not regulated by the EPA or local utilities. Private well owners should test their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
What is the lead level in 96804 tap water?+
Lead level data is not available in EPA records for 96804. Contact your utility for details.
Is there an active boil water notice in 96804?+
There are currently no active boil water advisories on record for 96804. Water treatment systems are operating within normal parameters.
Who provides tap water to 96804?+
Tap water in ZIP code 96804 is provided by Hnl-windward-pearl Harbor (EPA ID: HI0000331), serving approximately 631,389 residents.
What water filter should I use in 96804?+
Based on water metrics for 96804, we recommend None / Standard Pitcher. Look for certifications such as NSF/ANSI 42 (Chlorine, Taste & Odor).

Data Sources & Methodology

Water quality data for ZIP code 96804 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Hnl-windward-pearl Harbor. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →