How to Read Your Water Quality Report (Consumer Confidence Report)
Water Testing Guide
How to Read Your Water Quality Report (Consumer Confidence Report)
Every community water utility mails you a Consumer Confidence Report once a year. Here is what every line, abbreviation, and number actually means, what the report quietly leaves out, and how to find out what is really coming out of your own tap.
Quick note: "Consumer Confidence Report" has two unrelated meanings. One is a monthly economic index from The Conference Board about how optimistic shoppers feel. This page is about the other one: the annual drinking water quality report your water utility is legally required to send you. If you came looking for the economic index, this is not that page.
TL;DR
A Consumer Confidence Report (CCR), also called an annual water quality report, is a yearly summary every community water system must publish by July 1 under the Safe Drinking Water Act. It lists where your water comes from, which regulated contaminants were detected, and whether the system met federal limits. Find yours through the EPA CCR search tool, your utility's website, or the copy mailed to your home.
- What the CCR tells you: contaminants detected at the treatment plant or in the distribution system, measured against the legal limit (MCL)
- What it does NOT tell you: lead and copper from your own home's pipes and fixtures, PFAS unless your utility tested for it, and anything that meets the legal limit but not the stricter health goal
- "Meets all federal standards" is not the same as "nothing to worry about." The legal limit (MCL) and the health goal (MCLG) are two different numbers
- Private well owners do not get a CCR. You are your own utility, so testing is entirely on you
- To know what is actually at your tap, test your own water. Our City Water Test Kit ($199) checks 47 contaminants including lead at your faucet, with results reviewed by Aidan
Aidan Walsh, Mid Atlantic Water: "I get the same call every July. Someone opens the water quality report their city mailed them, sees a table full of abbreviations and numbers, and has no idea whether they should be worried. Here is the honest version: the report is useful and you should read it, but it describes the water leaving the plant, not the water in your glass. The lead in most homes comes from the house's own plumbing, and the report cannot see that. Read your CCR, then test your own tap. The two together give you the full picture."
What This Guide Covers
- What a Consumer Confidence Report Is
- How to Find Your Water Quality Report
- How to Read It, Line by Line
- The Abbreviations Decoded (MCL, MCLG, AL, ND, ppb)
- CCR Jargon Decoder
- A Sample CCR Table, Annotated
- What Your CCR Does NOT Tell You
- How Concerned Should You Be?
- What to Do After You Read It
- Frequently Asked Questions
What a Consumer Confidence Report Is
A Consumer Confidence Report (CCR) is the plain-language water quality report that every community water system in the United States is required to give its customers once a year. The requirement comes from the 1996 amendments to the federal Safe Drinking Water Act, and it is enforced by the U.S. Environmental Protection Agency. The report is sometimes labeled "Annual Water Quality Report," "Annual Drinking Water Quality Report," or just "Water Quality Report." They are all the same document.
By law, your water system must deliver the report to you by July 1 of each year, and it must cover the previous calendar year's monitoring data. Systems serving more than 100,000 people also have to post it online. The report has to tell you, in language a non-engineer can follow:
- The source of your water (a specific river, reservoir, or groundwater aquifer)
- Any regulated contaminants detected, and the level found compared to the legal limit
- The likely source of each detected contaminant (runoff, erosion, pipe corrosion, disinfection, and so on)
- Any violations of a drinking water standard during the year, and what the system did about them
- Health-effect language for any contaminant found above its limit, plus special notes for vulnerable groups
One thing to understand from the start: a CCR is fundamentally a compliance document. It exists to show that the utility met (or did not meet) federal regulations. It is not a personalized assessment of the water in your house. That distinction is the single most important thing in this guide, and we come back to it below.
Private Well Owners Do Not Get a CCR
The CCR requirement only applies to public community water systems. If you are on a private well, no agency tests your water and no report shows up in your mailbox. You are the utility. The EPA and CDC recommend testing private wells at least once a year. If that is you, start with our guide to testing your well water and our well water contaminant checklist instead.
How to Find Your Water Quality Report
If the mailed or emailed copy got lost in the recycling pile, there are four reliable ways to pull your current report:
- The EPA CCR search tool. Start at the EPA Consumer Confidence Report page, which links to state and utility report finders. Many states maintain a searchable index of every community system's report.
- Your utility's website. Search "[your city or water authority] consumer confidence report" or "[your utility] water quality report." Most utilities post the current year and several past years as PDFs.
- Your printed or emailed copy. Systems must deliver it directly to customers. Check your mail around late June, or your utility billing email.
- Call your water utility. The phone number is on your water bill. Ask for the most recent CCR. They are legally required to provide it.
People often search for their "water quality report by zip code." There is no single national zip-code lookup, because reports are organized by the water system (the PWSID, or Public Water System Identification number), not by zip code. The fastest path is usually to find your water system's name on your bill, then search the utility site or the EPA tool for that system. If you rent and do not get a water bill, ask your landlord or property manager which water system serves the building.
How to Read It, Line by Line
Most CCRs follow the same skeleton. Once you know the parts, every utility's report reads the same way.
1. The source water section
Near the top, the report names where your water originates: a surface source (a named river, lake, or reservoir) or a groundwater source (one or more wells drawing from an aquifer). It usually includes a line about a "source water assessment," which rates how vulnerable that source is to contamination. Surface water is generally more exposed to runoff and requires more treatment; groundwater is more protected but can carry naturally occurring minerals, radionuclides, or arsenic.
2. The detected contaminants table
This is the heart of the report, and the part that confuses everyone. It is a grid with one row per contaminant that was detected during the year. The columns almost always include:
- Contaminant (for example: lead, copper, nitrate, total trihalomethanes, fluoride, total coliform)
- The level detected, usually shown as both an average and a range (the lowest and highest single readings)
- The MCL (the legal limit) and the MCLG (the health goal). More on those two below
- Units (ppm, ppb, or pCi/L)
- Violation? A simple yes or no
- Likely source of the contaminant
The trap is the "range" column. A contaminant can show an average comfortably under the limit while a single high reading in the range sat much closer to (or above) it. If a number in the range column is near the MCL, that is worth a second look even when the average looks fine.
3. The lead and copper section
Lead and copper get special treatment because they usually do not come from the source water; they leach from pipes and fixtures. Instead of a plant-level number, the report shows a 90th percentile value from a sample of homes: "90 percent of the homes we tested were at or below this level." That means up to 10 percent of sampled homes were higher, and your home may not have been one of the homes tested at all. We come back to why this matters in the "what it does not tell you" section.
4. The violations and health language
If the system exceeded a limit or missed a monitoring deadline, there is a violations table and required health-effect language. Read this section carefully; it is where any real problem is disclosed. Many reports also include a standard paragraph noting that immunocompromised people, infants, and the elderly may want to take extra precautions, regardless of whether a violation occurred.
The Abbreviations Decoded
CCRs are dense with acronyms. Here is what each one means in plain language. The unit conversions matter: a number that looks tiny in one unit can be significant in another.
| Term | What It Means |
|---|---|
| MCL | Maximum Contaminant Level. The highest level of a contaminant allowed in drinking water. This is the enforceable legal limit. Set as close to the MCLG as feasible using the best available treatment technology. |
| MCLG | Maximum Contaminant Level Goal. The level at which there is no known or expected health risk. It is a health goal, not a legal limit, and it is not enforceable. For contaminants that cause cancer (like lead and many carcinogens), the MCLG is often zero. |
| MRDL / MRDLG | Maximum Residual Disinfectant Level (and its goal). Applies to disinfectants intentionally added to the water, mainly chlorine and chloramine. There is a benefit to keeping a disinfectant residual in the pipes, so these are handled separately from contaminants. |
| AL (Action Level) | The concentration that triggers required treatment or other steps. Used for lead (AL = 15 ppb) and copper (AL = 1.3 ppm). It is measured at customer taps, not at the plant. |
| TT (Treatment Technique) | A required process instead of a numeric limit. For some contaminants (like turbidity or certain pathogens), the rule specifies a treatment method rather than a single allowed number. |
| ppm | Parts per million, the same as milligrams per liter (mg/L). One ppm is one drop in roughly 13 gallons. |
| ppb | Parts per billion, the same as micrograms per liter (mcg/L). 1 ppm = 1,000 ppb. Lead and many trace contaminants are reported in ppb because the limits are so low. |
| pCi/L | Picocuries per liter. A measure of radioactivity, used for radon, radium, uranium, and gross alpha particles. |
| NTU | Nephelometric Turbidity Units. A measure of water cloudiness, which is a proxy for filtration performance. |
| ND | Not Detected. The contaminant was below the lab's detection limit. It does not always mean truly zero, just below what the method can measure. |
| 90th percentile | For lead and copper: 90 percent of sampled homes were at or below this value. Up to 10 percent were higher. It is a snapshot of a sample of homes, not a guarantee about yours. |
CCR Jargon Decoder
Pick a term you saw on your report. We will explain it in plain English and tell you whether it is something to act on.
A Sample CCR Table, Annotated
Here is what the detected-contaminants table looks like on a typical report. The numbers below are an illustrative example only, not from any real utility. Read across each row the way you would on your own report.
| Contaminant | Units | MCL | MCLG | Detected (avg) | Range | Violation | Likely Source |
|---|---|---|---|---|---|---|---|
| Lead (90th pct) | ppb | AL = 15 | 0 | 4.2 | ND - 22 | No | Corrosion of household plumbing |
| Copper (90th pct) | ppm | AL = 1.3 | 1.3 | 0.21 | ND - 0.6 | No | Corrosion of household plumbing |
| Nitrate | ppm | 10 | 10 | 2.1 | 0.8 - 3.4 | No | Fertilizer runoff, septic systems |
| Total Trihalomethanes (TTHM) | ppb | 80 | n/a | 52 | 31 - 74 | No | Byproduct of drinking water chlorination |
| Chlorine | ppm | MRDL = 4.0 | MRDLG = 4.0 | 0.9 | 0.4 - 1.6 | No | Water additive to control microbes |
| Fluoride | ppm | 4.0 | 4.0 | 0.7 | 0.6 - 0.8 | No | Additive promoting strong teeth |
How to read this example like a professional:
- Lead shows a 90th-percentile average of 4.2 ppb, which is under the 15 ppb action level, so "No" violation. But look at the range: a single home tested at 22 ppb, well over the action level. The system is compliant on paper, yet at least one home had a real problem. The MCLG is zero. This row alone is why you cannot trust a CCR to tell you about your specific home's lead.
- TTHM at 52 ppb is under the 80 ppb limit, but trihalomethanes are disinfection byproducts with a health goal that regulators treat as ideally lower. A high reading in the range (74) sat close to the limit. Worth noting if you want a carbon filter.
- Chlorine at 0.9 ppm is normal and expected. That is the residual keeping the pipes safe, not a contamination problem. If you dislike the taste, that is a point-of-use carbon question, not a safety one. See our breakdown of chlorine in water.
- Nitrate and fluoride are both well under their limits here. Nitrate is the one to watch on agricultural-area systems and for homes with infants.
What Your CCR Does NOT Tell You
This is the section the government and utility versions of this page never write, because the CCR is their document. A CCR is genuinely useful, but it has real blind spots, and they all point in the same direction: the report describes the system, not your home.
1. It does not test the water at your tap
With the narrow exception of the lead and copper home sampling (a small set of homes, possibly not including yours), CCR data is collected at the treatment plant and at points in the distribution system. Between the plant and your kitchen faucet, water travels through the water main, your service line, and your home's own pipes, solder, and fixtures. None of that is in the report.
2. It is largely blind to lead from your own plumbing
Lead is the clearest example. It rarely originates in the source water. It leaches from lead service lines, from the lead solder used in copper plumbing before 1986, and from brass fixtures (legally "lead free" brass could contain up to 8 percent lead before 2014). So a utility can post a clean 90th-percentile lead number while the water sitting overnight in your older home's pipes is far higher. The only way to know your home's lead is a first-draw test at your own tap. The CDC is explicit that there is no safe level of lead, particularly for children and pregnant women.
3. It may not cover PFAS
The EPA finalized the first national PFAS drinking water limits in 2024, and utilities are phasing in compliance monitoring. Depending on the year and your system, your CCR may not yet list PFAS, or may list it inconsistently. If you are in a known PFAS area, do not assume the absence of a PFAS line means your water is clear. See our guide to PFAS in drinking water and how to test for PFAS.
4. "Meets all standards" is a legal statement, not a health guarantee
The MCL (legal limit) and the MCLG (health goal) are two different numbers on purpose. The MCL is set as close to the health goal as is technically and economically feasible across thousands of systems. A contaminant can be fully compliant (under the MCL) while still sitting above the level at which there is no known risk (the MCLG). Compliance is the floor, not the ceiling, for what you might want in your own home.
5. It is months old and averaged
A report delivered by July covers the previous calendar year, and most values are annual averages. It cannot reflect a main break, a seasonal nitrate spike, or a change in your own plumbing that happened after the data was collected.
How Concerned Should You Be?
For most people on a compliant municipal system, the water is genuinely fine to drink, and this guide is not here to scare you. The point is to read the report accurately and know the specific situations that warrant testing your own tap. Use this as a quick gut check after you read your CCR.
What to Do After You Read It
The most useful thing a CCR can do is point you toward the few questions it cannot answer about your own home. Here is the practical follow-through:
- Note any contaminant near its limit (including high range values), any lead reading that concerns you, and whether PFAS is even listed.
- Test your own tap. A first-draw sample tells you what is actually in the water you drink, including lead and copper from your own plumbing that the CCR cannot see. Our City Water Test Kit is $199 and covers 47 contaminants (lead at parts-per-billion detection, chlorine, chloramine, copper, nitrate, and more) through the same NELAC and ELAP certified lab network the big mail-in testers use. Aidan reviews every result personally, with no obligation to buy anything.
- Match treatment to the actual result. Chlorine taste and TTHM point to carbon filtration. Lead points to an NSF-certified reverse osmosis or point-of-use system and, longer term, service-line replacement. Hardness points to a softener. The test tells you which.
- Send your results to Aidan. Email support@midatlanticwater.net or call 800-460-5810. If your water is fine, he will tell you so. That is the whole point of testing first.
For the bigger picture on municipal water and where treatment does and does not make sense, see our city water treatment guide and the broader how to test your tap water walkthrough. If you are weighing a move between sources, our well water vs city water comparison covers the testing differences.
"My city report said everything passed, but we have a 1950s house and a new baby. I ran the tap test anyway. Lead came back at 18 ppb first-draw even though the city's number looked fine. Aidan walked me through flushing, a certified filter for the kitchen, and getting the service line checked. I never would have known from the report."
Frequently Asked Questions
Is the Consumer Confidence Report the same as a water quality report?
Yes. "Consumer Confidence Report," "annual water quality report," and "annual drinking water quality report" all refer to the same document: the yearly summary your community water system is required to publish under the Safe Drinking Water Act. Note that the same phrase is also used for an unrelated monthly economic index from The Conference Board, which has nothing to do with drinking water.
How often is a CCR published, and when does it come out?
Once a year. Community water systems must deliver the report to customers by July 1, and it covers the previous calendar year's monitoring data. Larger systems also post it online. If you have not seen yours, check your mail in late June, your utility's website, or call the utility directly.
Does a CCR test the water at my tap?
Almost never. CCR data is collected at the treatment plant and in the distribution system. The one partial exception is lead and copper, which are sampled at a limited set of customer homes and reported as a 90th-percentile value. Your specific home may not have been tested. To know what is at your own faucet, including lead from your home's pipes, you need to test your own water.
What should I do if my CCR shows a violation?
Read the violations section closely. The report is required to describe what happened, the potential health effects, and the corrective action the utility took. Follow any guidance it provides (for example, a boil-water notice). Call your utility for the current status, and consider testing your own tap to confirm your home's water, especially if the violation involved a health-based contaminant.
Do private well owners get a Consumer Confidence Report?
No. The CCR requirement applies only to public community water systems. Private wells are not tested by any agency and no report is mailed to you. The EPA and CDC recommend testing a private well at least once a year for bacteria, nitrate, pH, and the contaminants relevant to your area. See our well water testing guide for what to test and how.
How do I find my water quality report by zip code?
There is no single national zip-code lookup, because reports are organized by water system (identified by a PWSID number), not by zip code. Find your water system's name on your water bill, then search that system on your utility's website or through the EPA Consumer Confidence Report page. If you do not get a water bill, ask your landlord or property manager which system serves the building.
If my CCR says the water meets all federal standards, is it safe?
Meeting all standards means the system is in legal compliance, which is reassuring, but it is not the same as "nothing to worry about." The legal limit (MCL) and the health goal (MCLG) are different numbers, and the MCL balances health with treatment feasibility across thousands of systems. Compliance also does not capture lead from your own plumbing or contamination between the plant and your home. For most people the water is fine; the specific reasons to test your own tap are an older home, an infant, a PFAS-area system, a taste or odor change, or a value near a limit on the report.
What is the difference between MCL and MCLG?
The MCL (Maximum Contaminant Level) is the enforceable legal limit. The MCLG (Maximum Contaminant Level Goal) is the level at which there is no known or expected health risk, and it is not enforceable. The MCL is set as close to the MCLG as is technically and economically feasible. For carcinogens like lead, the MCLG is zero, which is why a "compliant" reading above zero can still be worth reducing in your own drinking and cooking water.
Read your report, then confirm your own tap. Send your CCR (or just your address and any numbers that worry you) to Aidan and he will tell you in a few minutes whether anything is worth testing for, and whether your home's age or plumbing changes the picture. Email support@midatlanticwater.net or call 800-460-5810. No obligation, no hard sell, no charge for the read.
Written by Aidan Walsh, owner of Mid Atlantic Water. 32+ years helping homeowners on both city and well water across Pennsylvania, Maryland, Delaware, New Jersey, Virginia, and beyond. Article reviewed June 2026.