Why is my water milky?
It is understandable to be concerned about the safety of your water when it has a milky appearance, however the most common cause of milky water is tiny air bubbles and the water is safe to drink. The air bubbles can be caused by changes in pressure as the water travels from the distribution system to your household tap; water under pressure absorbs more dissolved oxygen than water that is not pressurized. Another cause of milky water can be from air trapped in mainlines. The presence of air bubbles does not affect the safety or quality of the water. Drinking water produced by the MDWS meets all Federal and State drinking water standards and is routinely tested throughout the month to ensure its compliance. The MDWS provides two barriers of protection to ensure that the water is safe from the moment of disinfection to the delivery at your household tap.

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

Show All Answers

1. What are the sources of drinking water?
2. Why are there contaminants in my drinking water?
3. Is my drinking water safe to drink?
4. How often is my water tested?
5. How can I get my water tested?
6. Do I need to take special precautions?
7. Do I need to filter my water?
8. What is the pH of my water?
9. Is there fluoride in my water?
10. Do I have hard or soft water?
11. What can I do about chlorine taste and odor?
12. I live on a dead-end (cul-de-sac) and my water has a yellow tinge to it. Is this okay?
13. Why is my water milky?
14. How can I tell if air bubbles are causing my water to look milky?
15. How can I get my rain catchment system water tested?
16. What other contaminants may be found in my drinking water?