Department of Water Supply
"By Water All Things Find Life"
2006 Water Quality Monitoring Results for West Maui

 
This water has been tested and meets all Federal and State Standards.
The following data is about your drinking water.

Lahaina System

This water serves: Puamana, Wainee, Kelawea, Lahaina, Wahikuli, Honokowai, Mahinahina, Kahana, Alaeloa, Napili

Source Name Origin Treatment
Kanaha Wells 1 & 2 Ground Chlorination
Waipuka Wells 1 & 2 Ground Chlorination
Kanaha Stream Surface Microfiltration,
Chlorination
Napili Well A Ground Granular Activated Carbon Filtration,
Chlorination
Napili Wells B & C Ground Chlorination
Honokohua Well B Ground Chlorination
Honolua/Honokahua Surface Multimedia/Direct Filtration,
Chlorination

If a contaminant is NOT SHOWN, IT WAS NOT DETECTED

Detected Primary Contaminants Unit Highest Level Range EPA's Allowable Limits MCL EPA's Allowable Limits MCLG Typical Source of Contaminant Is Your Water Safe? Compliance Met?
Detected at the sources
Barium ppm 0.003 0.002-0.003 2 2 Erosion of natural deposits Yes
Chromium ppb 2 1.2-1.3 100 100 Erosion of natural deposits Yes
Nitrates ppm 1.5 0.13-1.5 10 10 Erosion of natural deposits Yes
DBCP(1,2-dibromo-3-chloropropane) ppt 170 ND-170 40 0 Runoff/leaching from fumigant Yes
TCP
(1,2,3-trichloropropane)		 ppt 375 168-375 600* N/A Runoff/leaching from soil fumigant Yes
Detected in the distribution system
Contaminant Unit Highest Annual Average Range MCL
(Allowed)		 MCLG
(Goal)		 Typical Source of Contaminant In compliance?
TTHM'S (Total Trihalomethanes) ppb 15.6 2.3-32 80 N/A Disinfection by-product Yes
HAA'S (Haloacetic Acids) ppb 10.6 ND-31 60 N/A Disinfection by-product Yes
* Regulated in Hawaii but not by EPA

Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous systems, and may have an increased risk of getting cancer.


Microbiological Contaminants Detected in the distribution system Unit Result MCL MCLG Typical Source of Contaminant Is Your Water Safe? Compliance
Total Coliform Bacteria positive/negative 1 Highest monthly number of positive samples > or = 5% of monthly samples 0 Naturally present in the environment YES
 

Lead & Copper Rule Compliance
Contaminant Sample
Date		 Unit 90th
Percentile
Reading		 Action
Level		 # Samples
Above Action
Level		 In compliance?
Lead 2003 ppb < 5 15 2 Yes
Copper 2003 ppm 0.08 1.3 0 Yes

Infants and young children are typcially more vulnerable to lead in drinking water than the general population. It is possible that lead levels at your home may be higher than at homes in the community as a result of materials used in your home's plumbing. If you are concerned about elevated lead levels in your home's water, you may wish to have your water tested. As a general practice, you should flush your tap for 30 seconds to 2 minutes before using the tap water, if you have not used it for 4-6 hours. Additional information is available from the Safe Drinking Water Hotline at 1-800-426-4791.

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Honokohau System

This water serves: Honokohau Valley

Source Name Origin Treatment
Kapalua Wells Ground Chlorination

If a contaminant is NOT SHOWN, IT WAS NOT DETECTED

Detected
Primary
Characteristics		 Unit Highest
Level		 Range MCL
(Allowed)		 MCLG
(Goal)		 Typical Source of Contaminant In compliance?
Detected at the sources
Chromium ppb 1.3 - 100 100 Erosion of natural deposits Yes
Nitrates ppm 0.46 - 10 10 Erosion of natural deposits Yes
Detected in the distribution system
Detected Primary Contaminants Unit Highest Average MCL
(Allowed)		 MCLG
(Goal)		 Source of Contaminant In compliance?
TTHM'S (Total Trihalomethanes) ppb 8.3 80 N/A Disinfection by-product Yes
HAA'S (Haloacetic Acids) ppb ND 60 N/A Disinfection by-product Yes

 

Contaminant Sample
Date		 Unit 90th
Percentile
Reading		 Action
Level		 # Samples
Above Action
Level		 In compliance?
Lead 2004 ppb < 5 15 0 Yes
Copper 2004 ppm <  0.05 1.3 0 Yes


Infants and young children are typcially more vulnerable to lead in drinking water than the general population. It is possible that lead levels at your home may be higher than at homes in the community as a result of materials used in your home's plumbing. If you are concerned about elevated lead levels in your home's water, you may wish to have your water tested. As a general practice, you should flush your tap for 30 seconds to 2 minutes before using the tap water, if you have not used it for 4-6 hours. Additional information is available from the Safe Drinking Water Hotline at 1-800-426-4791.
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Definitions
MCL
Maximum Contaminant Level. The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available technology.
MCLG
Maximum Contaminant Level Goal. The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
Action Level
The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
CFU/100 ml
Colony forming units per 100 milliliters
mrem/yr
Millirems per Year (a measure of radiation)
pCi/L
Picocuries per Liter (a measure of radioactivity)
ppm
Parts per million or milligrams per liter
ppb
Parts per billion or micrograms per liter
ppt
Parts per trillion or nanograms per liter
NQ
Not Quantifiable
ND
Not Detected
NYA
Not yet available
<
less than
(1)
Analysis by the State Dept. of Health
(2)
Analysis by the Maui Dept. of Water Supply
(3)
Analysis by Montgomery-Watson Laboratories

Abbreviations   Compared to
ppm Parts per million milligrams per liter One second every 12 days
ppb Parts per billion micrograms per liter One second every 32 years
ppt Parts per trillion nanograms per liter One second every 32,000 years
ND Not Detected    
NQ Not Quantifiable    
< Less than    
NYA Not Yet Available    
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