How to Check Your Local Water Quality (Step by Step)

You can check your local water quality in four steps: read your utility's Consumer Confidence Report, search the EWG Tap Water Database by zip code, get a professional in-home or lab test, and compare the results. The EPA requires all public water systems to publish an annual water quality report, but that report only tells you what leaves the treatment plant -- not what comes out of your faucet.

What Is a Consumer Confidence Report and Where Do You Find It?

A Consumer Confidence Report (CCR) is an annual water quality report that your local water utility is required by law to publish. The EPA mandates that all community water systems serving the same people year-round must deliver a CCR to their customers by July 1 each year. According to the EPA, this requirement covers approximately 150,000 public water systems serving over 300 million Americans.

How to find your CCR:

1. Check your water bill. Many utilities include a link or a summary on the annual bill.

2. Visit your utility's website. Search for "water quality report" or "CCR" on the site.

3. Use the EPA's CCR search tool. Go to the EPA website and search by state, county, or water system name.

4. Call your water utility directly. They are required to provide a copy upon request.

What the CCR tells you:

• The source of your water (surface water, groundwater, or a mix)
• Detected contaminants and their levels
• Whether any contaminants exceeded EPA maximum contaminant levels (MCLs)
• How your water compares to federal and state standards

What the CCR does not tell you:

• What happens to your water between the treatment plant and your faucet
• Contaminants that may leach from your home's plumbing (lead from solder, copper from pipes)
• Emerging contaminants like PFAS that may not yet have enforceable federal limits
• Real-time water quality (the CCR reflects data from the previous calendar year)

The CCR is a good starting point, but it is not the full picture. It tells you what your utility delivers -- not what you actually drink.

How Do You Use the EWG Tap Water Database?

The Environmental Working Group (EWG) maintains an independent tap water database that covers more than 50,000 water utilities across the United States. Unlike the CCR, the EWG database compares your water's contaminant levels against health guidelines -- not just legal limits. The EWG notes that many EPA legal limits have not been updated in over 20 years and may not reflect current scientific understanding of health risks.

How to search:

1. Go to the EWG Tap Water Database at ewg.org/tapwater

2. Enter your zip code or city name

3. Review the list of detected contaminants for your utility

4. Note any contaminants that exceed EWG health guidelines (even if they are within EPA legal limits)

What to look for in the EWG results:

• Contaminants above health guidelines: The EWG sets health guidelines based on the latest peer-reviewed research, which are often stricter than EPA MCLs
• Total number of contaminants detected: Some utilities detect 10 or more contaminants, even if all are within legal limits
• PFAS detection: The EWG tracks PFAS contamination, which many CCRs do not yet include
• Disinfection byproducts: Trihalomethanes (THMs) and haloacetic acids (HAAs) are common in chlorinated water supplies

The EWG database is a powerful second opinion. If your utility shows contaminants above health guidelines, that does not mean your water is illegal -- it means current science suggests those levels may pose long-term health risks.

How Do You Get a Professional Water Test?

A professional water test measures what is actually coming out of your tap, which is the most accurate way to understand your household's water quality. The EPA recommends professional testing for anyone on a private well, and it is equally valuable for homes on public water systems where aging infrastructure or home plumbing may introduce contaminants after treatment.

Two options for professional testing:

Option 1: In-home water test (free)

• A certified water treatment technician visits your home
• Tests are performed on-site using reagents and meters
• You see results in real time (typically TDS, hardness, chlorine, pH, iron)
• Results come with an explanation of what each number means
• The technician may recommend treatment based on your specific results

Option 2: Certified laboratory test ($50 to $300)

• You collect a sample following the lab's instructions
• The lab tests for a broader range of contaminants (bacteria, heavy metals, PFAS, VOCs)
• Results arrive in 5 to 10 business days with detailed reporting
• State health departments often maintain lists of certified labs
• The CDC recommends this option for comprehensive water safety analysis

Which contaminants to test for:

| Test | Why It Matters | Typical Cost |

|---|---|---|

| Basic panel (TDS, hardness, pH, chlorine) | General water quality screening | Free (in-home) or $20-50 (lab) |

| Bacteria (total coliform, E. coli) | Identifies microbial contamination | $30-50 |

| Lead and copper | Old plumbing leaches metals | $30-60 |

| PFAS panel | Emerging contaminants linked to health issues | $200-400 |

| Comprehensive panel (50+ contaminants) | Full safety analysis | $150-300 |

For most homeowners, the most practical approach is to start with a free in-home test, then follow up with a lab test for any specific contaminants of concern.

How Do You Read and Understand Water Test Results?

Understanding your results requires knowing three things: what was detected, at what level, and how that compares to health-based standards. The EPA sets maximum contaminant levels (MCLs) for over 90 contaminants, while the EWG and other health organizations often recommend stricter limits based on newer research.

Key terms in your results:

• MCL (Maximum Contaminant Level): The highest level of a contaminant the EPA allows in drinking water. Meeting the MCL means your water is legally compliant -- but not necessarily free of health risk.
• MCLG (Maximum Contaminant Level Goal): The level at which no known health effects occur. For many carcinogens, the MCLG is zero.
• mg/L or ppm (parts per million): Standard unit for measuring contaminant concentration. 1 mg/L equals 1 ppm.
• ppb (parts per billion): Used for contaminants measured at very low concentrations, like lead (EPA action level: 15 ppb) and PFAS (EPA advisory: 4 ppt for PFOA and PFOS).

How to evaluate your results:

1. Compare each result to the EPA MCL. Any result above the MCL means your water exceeds the legal limit for that contaminant.

2. Compare to EWG health guidelines. A result within the MCL but above the EWG guideline suggests potential long-term risk based on current science.

3. Look at the full picture. A single slightly elevated reading may not be cause for alarm, but multiple contaminants near or above guidelines suggest your water would benefit from treatment.

4. Focus on health-impact contaminants first. Lead, arsenic, PFAS, nitrates, and bacteria are the highest-priority items. Hardness and iron are quality-of-life issues, not immediate health threats.

According to the USGS National Water-Quality Assessment, approximately one-third of the nation's groundwater sources contain at least one contaminant at levels above human health benchmarks. Knowing your numbers puts you in a position to make informed decisions.

Frequently Asked Questions

What is the fastest way to check my water quality?

Enter your zip code into the EWG Tap Water Database at ewg.org/tapwater. You will see every contaminant detected in your utility's water within seconds. For what is actually at your tap, schedule a free in-home water test.

How often should I test my water?

If you are on public water, checking your annual CCR and getting a professional test every 2 to 3 years is sufficient unless you notice changes in taste, color, or odor. If you are on a private well, the CDC recommends testing at least once per year for bacteria, nitrates, TDS, and pH.

Is my water safe if it meets EPA standards?

Legally, yes. But EPA standards set legal limits, not health-optimized limits. Many MCLs were established decades ago and have not been updated to reflect current science. The EWG health guidelines, based on newer research, are often 10 to 100 times stricter for certain contaminants.

What should I do if my water fails a test?

Do not panic. Identify which contaminants are elevated and at what levels. For immediate health threats (bacteria, high nitrates, high lead), switch to bottled water for drinking and cooking while you arrange treatment. For elevated but non-urgent results (hardness, moderate chlorine, iron), a whole-house filtration system resolves the issue without urgency.

Does a home water filter fix all water quality problems?

It depends on the system. A basic pitcher filter removes chlorine taste but little else. A whole-house carbon filtration system removes chlorine, chloramines, sediment, and many organic compounds. For specific contaminants like lead, PFAS, arsenic, or bacteria, you need a system designed for those particular substances. Always match the system to your test results.

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Knowing what is in your water is the first step to fixing it. If you want a clear picture of your home's water quality without the guesswork, schedule a free water test and see your results in real time.