Editorial advisory
What the data suggests for Collin County
Water Verdict
Collin County, Texas receives a good water quality assessment with a grade of A and a score of 70.8 out of 100. While the water supply is generally safe, occasional monitoring gaps or minor contaminant detections may occur. The county's primary USGS gauge drains roughly 773 square miles of upstream watershed, giving local source waters a regional footprint. At the most recent USGS reading, local streamflow was running above its historical mean at 128.0%.
Violation Context
EPA SDWIS records for Collin County, Texas show 8 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 0.6 violations per 100,000 people served, this rate is relatively low compared to many U.S. counties. This compliance record sits alongside an unusually deep monitoring archive: 62,414 water-quality results have been logged across the county in the EPA Water Quality Portal over the past five years.
Consumer Guidance
Tap water compliance data for Collin County shows a A grade. Collin County's drinking-water compliance score is 70.8 out of 100. Reviewing your utility's most recent Consumer Confidence Report provides the most accurate picture of detected contaminants and treatment status. An NSF-certified water filter can add an extra layer of safety for any household concerns. A pipeline streamflow snapshot from the E Fk Trinity Rv gauge is also available on this page.
Regional Context
Collin County has better water quality than the average county in Texas. Its water score is 40.4 points higher than the state average, indicating stronger water system performance relative to neighboring counties.
Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.