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. 2018 Feb 12;115(9):2078–2083. doi: 10.1073/pnas.1719805115

Fig. 3.

Fig. 3.

Total violations per water system, by housing density category and income group. Low-income counties have median household income below 75% of national median household income. In year 2015, national median household income was $55,775 and 45% of rural CWSs are located in counties defined as low-income.