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. Author manuscript; available in PMC: 2018 Nov 21.
Published in final edited form as: Environ Sci Technol. 2017 Nov 7;51(22):13450–13460. doi: 10.1021/acs.est.7b04269

Figure 3.

Figure 3

Percent of violations per year by (a) water source and (b) PWS type, as a percent within each category. Number of people served by systems in nitrate violation, categorized by (c) water source and (d) PWS type, and number of people served by water source (e) excluding spikes and (f) spikes only. A spike in the people served is defined as a single system contributing to >50% of the people served for a particular year. Spikes in 1998, 2000, 2006, 2015 and 2016 were caused by a single system in Ohio. Spikes in 1997, 2007, and 2013 were by three different systems in California, the spike in 2002 by a system in Long Island, and the spike in 2003 by a system in Arizona. Figure (c) is the sum of figures (e) and (f).