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Turbid water sources deemed unfit for drinking by individuals in Busia, Kenya, ranged from 10.5 to 87.0 NTU for 10 open water sources (CDC report to IPA, 2006).This site Talks about how nephelometric turbidity units or NTU. it tells you how many NTU is in different water sources. The main thing it talks about is how many NTU is unfit for drinking in 3rd world countries.

This water filtration system uses the idea of groundwater purification to replenish water cheaply. A layer of pebbles, gravel, sand and cotton is put into a water bottle cut in half in that order, top to bottom. A picture of this system is shown on the website above

"...this is just a miniature model made in 5 minutes. the elaborate plan is really that after this process, it will be aerated, so that the aerobic bacterias can form and eat up the unremovable toxins, which also produces the biogas, it is removed, then exposed to extreme uv radiation, and boiled that kills those bacterias too." -http://www.instructables.com/id/The-Simple-water-purification-System/ -In the comments section from the creator of the article

Ammonia is a common pollutant found in water. In small amounts it is harmless to most life, but in large amounts ammonia can be toxic. Ammonia is commonly used in Chloramine, a compound that sterilizes water in many urban water systems. The Rhode Island Sea Grant points out that ammonia contamination is a common problem in aquaculture, and that...

This article states that a good majority of the county lives in rural areas. Any filtration system that we might build will have to be small, cheap, and accessible so that it will be effective for the people there.