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WaterSafeCheck

ZIP Code 96733 Water Quality Report

Kahului, HI · Maui County County

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

0

Total Violations

0

Lead Risk

N/A

Contaminants

0

About Tap Water in ZIP Code 96733

Tap water in ZIP code 96733 (Kahului, HI) meets all federal safety standards and earns a solid B grade (score: 70/100). Served by Mahanalua Nui Subdivison, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

Mahanalua Nui Subdivison

EPA ID: HI0000251

Water Source

Ground Water

Population Served

606 residents

County

Maui County County, Hawaii

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Lead Levels in ZIP 96733

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

Lead Level: 18.5 ppb — EXCEEDS EPA Action Level

The 90th percentile lead level in 96733 is 18.5 ppb, which EXCEEDS the EPA action level of 15 ppb. This is a serious concern. The water utility is legally required to notify residents, identify the source of contamination, and take corrective action. Do not give this water to infants, children, or pregnant women without first passing it through a certified NSF/ANSI 53 water filter. Contact Mahanalua Nui Subdivison immediately for current guidance, or call the EPA Safe Drinking Water Hotline at 1-800-426-4791.
Lead Level (90th percentile)
18.50 ppb (0.0185 mg/L)
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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Violation History

Past 5 years — EPA SDWIS data

Mahanalua Nui Subdivison has recorded zero violations in the EPA compliance database over the past 5 years — a strong indicator of consistent regulatory compliance and careful monitoring.

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

Regulatory compliance risk for Mahanalua Nui Subdivison is rated Low — indicating a consistent track record of meeting EPA reporting and treatment requirements.

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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 96733. This means EPA monitoring has not found levels of regulated contaminants exceeding the Maximum Contaminant Levels (MCLs) set under the Safe Drinking Water Act — a positive indicator of water quality compliance.

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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
EPA Radon Zone

Lower potential

Zone 3

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

🛡 What Should You Do? — ZIP 96733 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from Mahanalua Nui Subdivison
  • ✓ 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

Frequently Asked Questions — ZIP 96733 Water Quality

Is tap water safe to drink in ZIP code 96733?+
Yes — tap water in 96733 (Kahului, HI) currently meets all federal EPA standards with a water safety grade of B. No health-based violations are on record in the past 5 years. You can drink your tap water with confidence, though running the tap for 30 seconds in the morning is always a good practice.
What is the lead level in 96733 tap water?+
The 90th percentile lead level in 96733 is 18.5 ppb (parts per billion). The EPA action level is 15 ppb. This exceeds the EPA action level — use a certified lead-reducing water filter.
Who provides tap water to 96733?+
Tap water in ZIP code 96733 is provided by Mahanalua Nui Subdivison (EPA ID: HI0000251). This system serves approximately 606 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 96733?+
ZIP code 96733 is served by ground water. Groundwater systems draw from underground aquifers. While naturally filtered, groundwater can still contain naturally occurring contaminants such as arsenic, radium, or nitrates at elevated levels in some regions.
Does 96733 have any active water quality violations?+
No active violations are on record for ZIP code 96733. EPA data shows this water system is currently in compliance with Safe Drinking Water Act standards.
How do I get a copy of my water quality report for 96733?+
Your water utility — Mahanalua Nui Subdivison — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "Mahanalua Nui Subdivison Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 96733?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 96733, with a clean compliance record, a standard carbon block filter meeting NSF/ANSI 42 is a good choice for taste and as a precaution.
Is 96733 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Given the detected lead level of 18.5 ppb in 96733, we recommend using a certified NSF/ANSI 53 water filter or certified bottled water for preparing infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 96733 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 Mahanalua Nui Subdivison. 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 →