How to Read Your Water Quality Report (CCR)
Once a year your water utility sends a report most people throw away. It is the fastest, free way to learn what is in your city water. Here is how to actually read it.
Every community water system in the United States is required to send its customers an annual water quality report, formally called a Consumer Confidence Report or CCR, by July 1 each year. It is the single most useful free document about your drinking water, and most people never read it. Learning to skim it well takes only a few minutes.
What the CCR is
The CCR summarizes what your utility detected in the water over the past year, where your water comes from, how the detected levels compare to federal limits, and any violations. It is a legal disclosure, so it has to be honest, though the formatting is often dense. Think of it as your utility’s annual report card.
How to find yours
It may arrive in the mail, with a water bill, or as a link. If you cannot find it, search your city or water provider’s name plus "Consumer Confidence Report" or "water quality report," or call the utility. Renters can ask their landlord or the local utility directly. The EPA also maintains pointers to many systems’ reports.
The parts that matter
Focus on three things. First, your water source, surface water or groundwater, which hints at likely contaminants. Second, the detected-contaminants table, which lists each substance found, the level, and the limit. Third, any violations or health-effect language, which a utility must include if it exceeded a standard. If there are no violations and detected levels sit below their limits, that is the reassuring result you are looking for.
Decoding the terms
| Term | Meaning |
|---|---|
| MCL | Maximum Contaminant Level: the enforceable legal limit |
| MCLG | Maximum Contaminant Level Goal: the health-based ideal, often zero |
| AL | Action Level: the trigger for utility action (lead, copper) |
| ppm / ppb | Parts per million / per billion (mg/L and ug/L) |
| ND | Not Detected |
For more on how those limits are decided, see how the EPA sets drinking water standards.
What it cannot tell you
The CCR describes water in the distribution system, not the water at your specific tap. It cannot capture lead or copper added by your own plumbing, and it does not cover private wells at all. So treat it as the starting point: if it is clean and you still want to check your own tap, especially for lead, run a water test. The report tells you about the system; a test tells you about your home.