City summary
What the indexed records say
Blue Ridge has 1 published ZIP profile across Collin County. The indexed median is 7 PPM, compared with 111 PPM across Texas.
Among the 523 Texascities with an indexed median, Blue Ridge ranks #518from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.
Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.