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Is Greensboro Water Safe to Drink?
City of Greensboro Water Resources · 2025 data · official source
This is the safety page for Greensboro — how hard the water is (and what that costs) lives on the Greensboro water hardness page · see how Greensboro compares across all of North Carolina on the North Carolina hardness guide · or browse every North Carolina city by safety status on the North Carolina water quality page.
Greensboro's water has Perfluorohexane sulfonate (PFHXS) above the EPA legal limit. See the breakdown below and consider a filter rated for that contaminant.
What's in Greensboro's water
Detected contaminants reported for City of Greensboro (EPA system ID NC0241010).
Source: EWG tap water database (Aug 2026).
Perfluorohexane sulfonate (PFHXS) exceeds the EPA legal limit. This is worth investigating — a filter rated for that contaminant may be appropriate.
How to read this table: the legal limit (the EPA's Maximum Contaminant Level (MCL)) is the enforceable safety line — it's what regulators actually require. The EWG guideline column is a much stricter, voluntary health benchmark (often 100–1000× lower than the legal limit). Many contaminants sit below the legal limit but above the EWG line — that's common nationwide and means the water is still legally safe, not that it's dangerous.
| Contaminant | Typical level | EPA legal limit | EWG guideline | Status |
|---|---|---|---|---|
| Bromodichloromethane | 6.17 ppb | unregulated | 0.06 ppb | Above EWG |
| Chloroform | 27.6 ppb | unregulated | 0.4 ppb | Above EWG |
| Chromium (hexavalent) | 0.112 ppb | unregulated | 0.02 ppb | Above EWG |
| Dibromoacetic acid | 0.083 ppb | unregulated | 0.03 ppb | Above EWG |
| Dibromochloromethane | 0.736 ppb | unregulated | 0.1 ppb | Above EWG |
| Dichloroacetic acid | 11.1 ppb | unregulated | 0.2 ppb | Above EWG |
| Haloacetic acids (HAA5) | 21.6 ppb | 60 ppb | 0.1 ppb | Below limit |
| Haloacetic acids (HAA9) | 60.3 ppb | unregulated | 0.06 ppb | Above EWG |
| Perfluorodecanoic acid (PFDA) | 0.19 ppt | unregulated | 0.006 ppt | Above EWG |
| Perfluorohexane sulfonate (PFHXS) | 11.1 ppt | 10 ppt | 0.001 ppt | Above limit |
| Perfluorononanoic acid (PFNA) | 0.35 ppt | 10 ppt | 0.006 ppt | Below limit |
| Total trihalomethanes (TTHMs) | 34.5 ppb | 80 ppb | 0.15 ppb | Below limit |
| Trichloroacetic acid | 9.62 ppb | unregulated | 0.1 ppb | Above EWG |
Levels are system-wide utility averages. The legal limit is the EPA's Maximum Contaminant Level (MCL). EWG also flags 15 contaminant(s) as exceeding its own stricter (non-legal) health guideline — shown as an informational note only, not a safety claim.
Not sure what these levels mean for your health? Read our complete contaminants guide — what's detected vs. what matters, and how to read the numbers.
What actually matters in Greensboro's water
Most of the numbers in the table are below the legal limit and aren't worth your worry. Here's the honest read on the ones people actually ask about in Greensboro:
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Chromium-6 (the hexavalent form) is a known carcinogen when inhaled and is associated with stomach and intestinal tumors in drinking-water studies; the total-chromium MCL covers all forms. The basis is allergic dermatitis plus the cancer concern from the hexavalent form.
Source: EPA MCL
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Trihalomethanes are disinfection byproducts. Long-term exposure above the limit is associated with liver, kidney, and central nervous system problems plus an increased risk of cancer (most consistently bladder). The limit is a deliberate trade-off: you can't remove them without abandoning disinfection, which would risk far worse microbial disease.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Why the limit exists: PFAS are "forever chemicals" — extremely persistent. The limits exist because several PFAS are linked to cardiovascular, immune, liver, and thyroid effects, elevated cholesterol (PFNA), and increased incidence of certain cancers (kidney/testicular for PFOA, liver for PFOS). Note: the EPA has proposed revising parts of the individual PFAS MCLs; the underlying health-science rationale is unchanged regardless of the current legal number.
Who it matters most for: Pregnant women, infants, and children (developmental and immune effects).
Source: EPA MCL (2024)
Why the limit exists: PFAS are "forever chemicals" — extremely persistent. The limits exist because several PFAS are linked to cardiovascular, immune, liver, and thyroid effects, elevated cholesterol (PFNA), and increased incidence of certain cancers (kidney/testicular for PFOA, liver for PFOS). Note: the EPA has proposed revising parts of the individual PFAS MCLs; the underlying health-science rationale is unchanged regardless of the current legal number.
Who it matters most for: Pregnant women, infants, and children (developmental and immune effects).
Source: EPA MCL (2024)
Why the limit exists: PFAS are "forever chemicals" — extremely persistent. The limits exist because several PFAS are linked to cardiovascular, immune, liver, and thyroid effects, elevated cholesterol (PFNA), and increased incidence of certain cancers (kidney/testicular for PFOA, liver for PFOS). Note: the EPA has proposed revising parts of the individual PFAS MCLs; the underlying health-science rationale is unchanged regardless of the current legal number.
Who it matters most for: Pregnant women, infants, and children (developmental and immune effects).
Source: EPA MCL (2024)
Why the limit exists: Haloacetic acids are disinfection byproducts associated with an increased risk of cancer at sustained elevated exposure. Same trade-off as TTHMs — the limit balances cancer risk against the necessity of disinfection.
Source: EPA MCL / HC MAC
Where Greensboro's water comes from — and how it's treated
Lake Townsend, Lake Higgins reservoirs
Like every U.S. municipal supply, Greensboro's water is disinfected and monitored against EPA National Primary Drinking Water Regulations, published annually in the Consumer Confidence Report (CCR). If you want to read the raw report for yourself, our how to read your water quality report guide walks you through it line by line.
Water quality vs. water hardness — don't confuse the two
"Water quality" (is it safe to drink) and "water hardness" (how much scale it leaves) are entirely different things — and confusing them leads to bad purchases. Greensboro's water is soft (2.5 GPG), which has no bearing on its safety — hardness is a cosmetic and appliance concern, not a health one. For what that hardness costs you in scale, appliance wear, and water-heater efficiency, see the Greensboro water hardness page.
If contaminants concern you — add a drinking-water filter
Should you filter Greensboro's water?
The softener handles hardness; a drinking-water filter removes Chromium-6 and removes Pfas — if Greensboro's reported levels concern you. EPA / NTP: Chromium-6 (hexavalent chromium) is a known carcinogen when inhaled and is linked to stomach and intestinal tumors in drinking-water studies. EPA: PFAS ("forever chemicals") are linked to certain cancers, immune and thyroid effects, developmental issues, and elevated cholesterol. EPA MCL: 4 ppt for PFOA/PFOS. For a full breakdown of what each filter type removes, see best whole-house water filters.
We may earn a commission when you buy through links on our site. This doesn't affect our recommendations. Full disclosure.
When to call a professional
Greensboro's water has Perfluorohexane sulfonate (PFHXS) above the legal limit, so this is the one case where having a professional look at your tap — not just the city-wide average — is genuinely worth it. A licensed water-treatment specialist can test your home's water specifically, confirm whether your plumbing is contributing anything extra, and recommend a correctly-rated filter (for PFAS, a point-of-use reverse-osmosis or granular-activated-carbon system, for example).
Certified, independent results come from a state/province-licensed lab, not a company with a sales incentive — ask for a lab that reports to the EPA or your state.
Frequently asked questions
Is Greensboro tap water safe to drink?
Greensboro water has contaminant(s) above the legal limit. Review the breakdown below before drinking unfiltered.
Who tests Greensboro's water, and how often?
City of Greensboro Water Resources is required by the EPA to test and publish an annual Consumer Confidence Report (CCR), linked on this page.
Where does Greensboro drinking water come from?
Lake Townsend, Lake Higgins reservoirs
Should I filter Greensboro's tap water?
Yes — a filter rated for the specific contaminant(s) above the limit is worth considering. See the full breakdown for which one matters.
Is Greensboro water hard?
Greensboro water is soft at 2.5 GPG (43 ppm). Hardness is separate from safety — it affects scale and appliances, not health. See the Greensboro water hardness page for the full picture.
Sources & method
All contaminant levels are drawn from official, published data — EWG tap water database (Aug 2026) (source). We cite the legal limit for each contaminant so you never see a bare scare number.
- · City of Greensboro Water Resources — water-quality report we reviewed
- · USGS — Water Hardness
- · EPA — Drinking Water Regulations
- · CDC — Drinking Water
- · EWG — Tap Water Database
- · Our complete contaminants guide (what's detected vs. what matters, how limits are set)
- · How to read your water quality report — line by line
Compare Greensboro to Other North Carolina Cities
How Greensboro's water quality stacks up against nearby cities — same North Carolina data, same legal limits.
Other Cities With Exceedances
Cities where a contaminant also runs above the legal limit — see how they compare to Greensboro.
Explore More
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💧 Water treatment pros: this page is yours to share
This page helps customers understand what's in their water and whether they need a filter — so they can weigh whether service is worth it. We recommend sharing this page along with our complete contaminants guide in your next quote or follow-up to fully explain the value of your services.