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Updated 2026-10-15
County water report

Guilford County Water Quality: 2 Cities Ranked by the Records

Guilford County, North Carolina: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Guilford County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems4.0 ng/L federal MCL (2024) · US EPAHighest35.6 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems10 ng/L federal MCL (2024) · US EPAHighest16.8 ng/L
Perfluorooctanoic acid (PFOA)Detected in 2 systems4.0 ng/L federal MCL (2024) · US EPAHighest5.6 ng/L
Haloacetic acids (HAA5)Detected in 1 system60 ppb federal MCL · US EPAHighest42 ppb
Total trihalomethanes (TTHM)Detected in 1 system80 ppb federal MCL · US EPAHighest49 ppb
CopperDetected in 1 system1.3 mg/L (action level) · US EPAHighest0.18 mg/L
FluorideDetected in 1 system4.0 mg/L · US EPAHighest0.55 mg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.3 ng/L
5 more contaminants detectedShow
Perfluorohexanoic acid (PFHxA)Detected in 2 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest10.4 ng/L
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest7.2 ng/L
Perfluorobutanoic acid (PFBA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest10 ng/L
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest3.8 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest9.7 ng/L
22 substances tested, none detected in any systemShow

Tested in these 2 systems: GREENSBORO, CITY OF, HIGH POINT, CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • Lead (90th percentile)
  • Lithium
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
2 cities

Cities ranked by the records

Showing 2 of 2 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Guilford County2 of 2 city reports had a PFAS sample above a 2024 EPA limit
  1. Greensboro35.6 ng/L
  2. High Point11 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in North Carolina
Lead

0of 2 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in North Carolina
Who supplies the county

Largest water systems

  1. GreensboroGREENSBORO, CITY OF · NC0241010
    319,588 served
  2. High PointHIGH POINT, CITY OF · NC0241020
    118,662 served
Questions

Frequently asked

How does Guilford County tap water compare across cities?

PurityMap ranks 2 cities in Guilford County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Greensboro's main water system: GREENSBORO, CITY OF · PWSID NC0241010 · Purity Score 62 (Fair) · Confidence: high · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Guilford County cities had a PFAS sample above a 2024 EPA limit?

2 of 2 Guilford County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Greensboro (PFOS 35.6 ng/L), High Point (PFOS 11 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 2.

Is there lead in Guilford County tap water?

Utilities report lead as a 90th-percentile result from home taps. 0 of 2 Guilford County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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