What we cover, and what we have graded.
Every incorporated city, town and village within thirty miles of Rockwall, Dallas, Denton, Fort Worth and Arlington — 235 of them. The brighter marks are the thirteen whose yearly water quality report we have read and scored. The rest are places we serve and study, not places we have put a number on.
13 graded — click for the report card 222 more — in the study area, not graded yet The outline is the thirty-mile study boundary.
235 incorporated places is not the same as 367 community water systems: one city can hold several systems, and one system can cross city lines. The map shows municipalities, which is how people look for their own town — the grades belong to water systems.