How to Read Your Water Quality Report (CCR)
Every US community water system mails an annual Consumer Confidence Report. Here's what's actually in it, which numbers matter, and what it can't tell you about your own tap.
TapGraded Editorial · Editorial team · July 10, 2026
If you get your water from a public utility, you receive a water quality report once a year whether you notice it or not. It’s called the Consumer Confidence Report (CCR), and every community water system in the country is required to send one to its customers by July 1 each year. It’s the single most useful document about your tap water that you already have access to — if you know how to read it.
What a CCR must contain
The EPA requires the report to tell you, at minimum, where your water comes from and what was found in it:
- The source of your water (a river, lake, reservoir, or groundwater aquifer).
- The regulated contaminants detected in the system’s testing, usually shown with the level found next to the legal limit.
- The health effects of any contaminant that violated an EPA standard, and what the system did about it.
- Educational language about contaminants of concern such as Cryptosporidium and lead.
- Contact information to ask questions.
The numbers that matter
Most CCRs present detected contaminants in a table. Two columns do the work: the level found and the MCL (Maximum Contaminant Level — the enforceable legal limit). If the level found is at or above the MCL, that’s a violation, and the report has to explain it. If it’s well below, the system met the standard for that contaminant during the reporting period.
Watch for a few specifics:
- Lead and copper are reported as a 90th-percentile value — the level 90% of sampled homes fell below — not an average. That’s the figure the Lead and Copper Rule is judged against.
- Violations are the headline. A monitoring or reporting violation means the system missed a test or a deadline; a health-based violation means a standard was actually exceeded. They are not the same thing, and a good CCR distinguishes them.
- “Non-detect” or a blank means the contaminant wasn’t found above the reporting threshold — it doesn’t mean the system tested for everything.
What a CCR can’t tell you
A CCR describes the water leaving the treatment plant and moving through the distribution system. It can’t tell you what’s happening in your own home. Lead is the clearest example: it usually enters water from a lead service line or old plumbing between the water main and your faucet, so two houses on the same street can have very different lead levels even though they share one CCR. If lead is a concern, a certified tap test is the only way to know your number.
Cross-check it against the Tap Grade
The CCR is your system’s own annual snapshot. TapGraded pulls the same underlying EPA violation, lead, and PFAS records for every system and turns them into a single Tap Grade you can compare across utilities. Reading your CCR and looking up your system’s grade together gives you both the detail and the context. You can also dig into any specific contaminant on our contaminant pages.
Sources
- US EPA — “CCR Information for Consumers” — https://www.epa.gov/ccr/ccr-information-consumers
- US EPA — “Lead and Copper Rule” — https://www.epa.gov/dwreginfo/lead-and-copper-rule
- US EPA — “National Primary Drinking Water Regulations” — https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations
Source: Regulatory facts cited inline against EPA sources; see Methodology & Data sources · Data as of July 10, 2026
This article is informational and is not health, legal, or engineering advice. Questions or corrections: contact@tapgraded.com.