Department of Water Supply
"By Water All Things Find Life"
2007 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 Ground Chlorination
Waipuka Wells Ground Chlorination
Napili Wells Ground Chlorination
Honokohua Wells Ground Chlorination
Kanaha Stream Surface Microfiltration, Chlorination
Honolua/Honokahua Ditch Surface Multimedia/Direct Filtration

If a contaminant is NOT SHOWN, IT WAS NOT DETECTED

Detected Primary Contaminants Unit Highest Detected 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
Nitrate (as N) ppm 1.7 0.10-1.7 10 0 Erosion of natural deposits YES
DBCP(1,2-dibromo-3-chloropropane) ppt 150 ND-150 40 0 Runoff/leaching from fumigant YES**
TCP
(1,2,3-trichloropropane)		 ppt 502 ND-502 600* 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 Is Your Water Safe? Compliance Met?
TTHM'S (Total Trihalomethanes) ppb 25 3-120 80 N/A Disinfection by-product YES
HAA'S (Haloacetic Acids) ppb 14 ND-57 60 N/A Disinfection by-product YES
*Regulated in Hawaii but not by EPA
**Contaminants are removed by GAC filtration and are not found in the distribution system.

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 Met?
Total Coliform Bacteria Positive/Negative 2 - Highest monthly number of positive samples > or = 5% of monthly samples are positive 0 Naturally present in the environment YES
 

Contaminant Sample Date Unit 90th
Percentile
Reading		 Action Level # Samples Above
Action Level		 Is Your Water Safe? Compliance Met?
Lead 2006 ppb < 5 15 2 YES
Copper 2006 ppm 0.08 1.3 0 YES

Infants and young children are typically 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
Contaminants		 Unit Highest
Detected
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
Nitrates ppm 0.24 N/A 10 0 Erosion of natural deposits YES
Detected in the distribution system
TTHM'S (Total Trihalomethanes) ppb 6.6 N/A 80 N/A Disinfection by-product YES
HAA'S (Haloacetic Acids) ppb ND N/A 60 N/A Disinfection by-product YES

 

Contaminant Sample Date Unit 90th
Percentile
Reading		 Action
Level		 # Samples
Above Action
Level		 Is Your Water Safe? Compliance Met?
Lead 2007 ppb < 5 15 0 YES
Copper 2007 ppm < 0.05 1.3 0 YES


Infants and young children are typically 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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