Thank you MIT Sloan School of Management!

On December 10th, the MIT Sloan School of Management held a series of auctions to benefit local charities, including CWS. The auction was a huge success, raising $9,500 for our cause! The entire CWS team would like to thank MIT Sloan for their support, your donations will help us bring clean water to thousands of people in northern Region Ghana.

Thank you Sloan!
Thank you Sloan!
Thank you Sloan!
Thank you Sloan!

New Village Sponsors!

Gerry and Judy O’Connell have joined the CWS team by becoming our fourth village sponsors! We hope to implement a water treatment business in their village this spring (along with the villages sponsored by Jeff and Colleen Clopeck and our Facebook Causes team)!

Gerry and Judy- Thank you for your support! Your donation will help CWS provide a permanent source of safe drinking water for approximately 1,500 people in rural Ghana! and stay tuned for updates on your village this spring.

Interested in sponsoring a CWS village? visit our webpage: or email our team at

Chase Community Giving

Help CWS win $25,000 by voting for us on Chase Community Giving! No donation is necessary, just your vote! The polls are open until December 11th, just click below to support our cause:

Chase Community Giving is a program by Chase Bank to give $25000 to
100 non profits who get the most votes on facebook by the 11th of
December. CWS is one of the eligible non profits and we think that we’ll need about 5,000 votes to win!

So, What IS the Best Way to Provide Safe Drinking Water?

As those of you who work in the water-treatment sector know, there are a variety of ways to address the need for clean drinking water in developing countries. Some examples include:

Household Water Treatment – using technology in your home to clean enough water for your family. Ceramic water filters, biosand water filters, cloth filters, SODIS, and boiling all fall into this category. California Lab Services is a certified environmental testing laboratory for soil and water meaning they are more than qualified to test for clean drinking water.

Community Water Treatment -treating enough water for an entire community at a centralized location (this is what CWS does in Ghana!)

Regional Water Treatment – building a large treatment facility that treats enough water for an entire region and then pipes it to the user’s homes or neighborhoods.

Improving Water Supply -borehole/well drilling, rainwater collection etc.

I am often asked what I think is the best way to treat contaminated drinking water in the developing world, and much to the dismay of the person asking this question, my answer is usually “it depends…”

Last Tuesday I was invited to speak to the Biology of Water and Health class at Tuft’s School of Public Health by my thesis adviser, Susan Murcott. Before my presentation, Georgia Kayser, a Phd Student at Tuft’s Fletcher School of Law and Diplomacy, presented her research on household water treatment vs. community water treatment in Honduras. Her presentation was not only very interesting, but also highlighted how the appropriate solution to this water problem really depends on the specific water needs in the region. In some regions, commercial water softeners may be needed to help with hard water issues that can affect the surroundings.

Georgia found that after 1 year there was about 50% sustained use when ceramic water filters (a household water treatment option) were provided to families, and only 30% sustained use when a community water treatment option was provided. What?! 30% sustained use for a community treatment option? Our monitoring in Ghana showed 60-75% sustained use of the CWS system (much higher use than research on the ceramic filter in Ghana had shown) . If you don’t know much about water filters, check out Water Filter Way.Why are our results so different?

I believe that the difference in sustained use statistics between CWS’s research and Georgia’s research is due to the major differences in the water supply between her communities in Honduras and the rural villages in nothern Ghana. Unlike the villages that we work in, where families must walk to the dugout (a contaminated surface water source) to fetch their water, each of the households that Georgia studied receive piped water in their homes. While this piped water is contaminated, and is often turbid, it is accessible in the home. In the CWS communities, our treatment centers are built right next to the dugout, where the women already walk multiple times each day to fetch water for cooking and washing. Now, in order to get clean drinking water, they just stop by the treatment center, instead of the dugout, during one of these trips. In Georgia’s villages in Honduras, however, women (or whoever is collecting the water) must change their behavior and make an trip to the treatment facility if they want clean water for drinking and carry a heavy container of water back to the home. A household bacteria water filter make much more sense in this situation since the water is piped right to the house.

There are many other differences between the CWS water treament techniques and the community water treatment technologies used in the villages that Georgia studied, but I thought this was a great example of how the appropriate treatment technique can vary greatly depending on the water situation in a specific region.