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Contaminants that may be present in source water include: • Microbial - viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife • Inorganic - salts and metals, which can be naturally-occurring as a result of urban runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming • Pesticides or herbicides - may come from a variety of sources such as agriculture, storm water runoff, and residential uses • Organic chemical - includes synthetic and volatile organics, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems • Radioactive contaminants - can be naturally-occurring or be the result of oil and gas production and mining activitiesIn order to ensure that tap water is safe to drink, the EPA prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled water, which must provide the same protection for public health.
These people should seek advice about drinking water from their health care providers. You may also inquire about EPA / CDC guidelines by calling the Safe Drinking Water Hotline at (800) 426-4791.
Maui DWS water in the Upper Kula area is treated with chloramines, a disinfectant that produces fewer disinfection by-products such as trihalomethanes. As such, customers who have unique water quality needs including those who use specialized treatments such as kidney dialysis machines or fish owners should make the necessary adjustments to remove chloramines.
Please see Water pH Chart for details. Water pH Chart
Water Hardness Scale
The two barriers of protection are the maintenance of steady water pressure and the maintenance of chlorine residual throughout the system. Both pressure and chlorine residual are monitored by the MDWS staff in order to ensure that our drinking water is safe and in compliance with both Federal and State drinking water standards.
• Water Pressure: A minimum pressure of 20 psi is required by regulation and the pressure in the MDWS distribution system can range from 50-160 psi depending on location. The maintenance of pressure in the distribution system prevents outside contaminants from entering into the pipes during a leak or pipe failure.
• Chlorine Residual: A minimum chlorine residual of 0.20 mg/L chlorine is maintained and the chlorine residual in the distribution system can range from 0.5-1.5mg/L depending on location. The maintenance of a chlorine residual prevents potential microbial contamination that could occur from a loss of pressure in the pipes.
In order to get rid of the appearance of air bubbles, the best thing to do is fill a pitcher with water and let it sit open to the air until all the air bubbles have disappeared. If you have any concerns about your water please call the DWS Lab at 808-270-7550
Water Comparison Test
The University of Hawaii also provides extensive information on rain catchment systems as well as provides home testing kits for a fee. For more information, call 808-329-2861 or visit http://www.ctahr.hawaii.edu/hawaiianrain/index/html University of Hawaii - Rain Catchment Systems