Consumer Confidence Report · first pass
How to read a water quality report before buying a filter
A field guide to contaminant tables, units, ranges, violations, sample dates, action levels, and the limits of a utility-wide report.
- Report name
- CCR
- Published
- Annually
- Read with
- Units + dates
- Does not replace
- Tap testing
01 / Field note
Confirm that it is your current system and year.
A Consumer Confidence Report summarizes a public water system’s monitoring and compliance information for a reporting period. Confirm the utility name, service area, report year, and source-water description before using the tables.
If the home moved utilities, uses a community well, or has a private well, a city report found by ZIP code may be the wrong record. Private wells require owner-arranged testing rather than a utility CCR.
02 / Field note
Read the whole row, including the unit.
A detected level is meaningless without its unit and comparison value. Parts per million, parts per billion, and parts per trillion differ by factors of one thousand. Reports may also use treatment-technique language, action levels, maximum contaminant levels, or maximum residual disinfectant levels.
The highest value, range, annual average, 90th percentile, and a single sample are not interchangeable statistics. Use the column definitions and footnotes supplied by the utility.
03 / Field note
Separate a system result from a premise-plumbing question.
The report describes the public system, not every moment at every household tap. Lead can be contributed by a service line or building plumbing. Taste, odor, sediment, or a localized issue can also arise after water reaches the property.
Use the CCR as the starting record, then follow utility or public-health sampling guidance when the decision depends on the home or a specific tap.
04 / Field note
Translate the result into one equipment claim.
Write down the exact analyte, value, unit, sample date, and desired treatment point. Then search an independent certification listing for an exact product model with that reduction claim.
- Do not treat ‘NSF certified’ as a complete answer.
- Do not choose whole-house treatment when only one drinking tap needs treatment without comparing cost and scope.
- Do not use a filter as a substitute for following a violation notice or do-not-use advisory.