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Table 1 Description of study sites and sample collection
| Region | District | Community | Number of borehole samples taken | Date of sampling |
|---|---|---|---|---|
| Upper West region | Nadowli-Kaleo | Nadowli | 1 | 13/4/2015 |
| Wa West | Bulka, Bulinkyere, Buliyuu, Bungbere, Chabere, Charlie, Daku, Domawaa School, Dornye School, Ga clinic, gurungu, Jagluu Soleyiri, Jinokuraa, Metti, Mwabasi, Nankapaabule, Nanyayiri, Samambo, Siea-Suana, Siira Morazu, Tankara, Wekorbo | 22 | 12/1/2015–16/1/2015 | |
| Wa East | Balazuu, Bayiri, Guonoo, Nahaa, Zinyee Kumasi, Zinye | 6 | 23/12/2014 | |
| Wa Municipal | Islamic SHS, Bamahu, Napogiba Koley, Wa township | 5 | 24/1/2015 | |
| Jirapa | Jirapa Farms, Jirapa Township, Jirapa Township, Hiineteng N-Nyarateng | 4 | 14/2/2015–10/4/2015 | |
| Sissala West | Fielmuo, Suleteng, Gyanvuur, Liero, Zienle’s house, Liero Nyokubagr | 5 | 24/7/2014–15/4/2015 | |
| Northern region | Sawla-Tuna-Kalba | Dandanpiri, Dankomplayiri, Nochiteyiri, Sagbayiri, Sey-Goyiri, Tuna-Balie, Wula | 7 | 1/4/2015 |
