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Updated 2026-10-15
County water report

Will County Water Quality: 13 Cities Ranked by the Records

Will County, Illinois: 13 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 Will 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.

LithiumDetected in 8 systems of 13 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest100 µg/L
  • MANHATTAN100 µg/LSample date: 2025-06-03 to 2025-12-03
  • CHANNAHON69 µg/LSample date: 2024-06-04 to 2024-12-11
  • LOCKPORT65 µg/LSample date: 2023-12-12 to 2024-08-28
  • FRANKFORT62.6 µg/LSample date: 2023-01-25 to 2023-07-24
  • JOLIET54.7 µg/LSample date: 2025-02-19 to 2025-08-14
  • ROMEOVILLE54.6 µg/LSample date: 2024-06-13 to 2025-06-09
  • CREST HILL34.8 µg/LSample date: 2023-06-12 to 2023-12-28
  • SHOREWOOD27.9 µg/LSample date: 2023-02-06 to 2023-08-07
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • MOKENANot detected · below 9.0 µg/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
Perfluorooctanoic acid (PFOA)Detected in 2 systems of 13 tested4.0 ng/L federal MCL (2024) · US EPAHighest13.7 ng/L
  • CREST HILL13.7 ng/LSample date: 2023-06-12 to 2023-12-28
  • CHANNAHON4.6 ng/LSample date: 2024-06-04 to 2025-01-06
  • FRANKFORTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • LOCKPORTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-12-12 to 2024-08-28
  • MANHATTANNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • ROMEOVILLENot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-13 to 2025-06-09
  • SHOREWOODNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 13 tested4.0 ng/L federal MCL (2024) · US EPAHighest5.9 ng/L
  • CHANNAHON5.9 ng/LSample date: 2024-06-04 to 2025-01-06
  • CREST HILLNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-12 to 2023-12-28
  • FRANKFORTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • LOCKPORTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-12-12 to 2024-08-28
  • MANHATTANNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • ROMEOVILLENot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-13 to 2025-06-09
  • SHOREWOODNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Copper (90th percentile)Detected in 1 system1.3 mg/L federal action level · US EPAHighest1.686 mg/L
  • CREST HILL1.686 mg/LMonitoring period: 2023–2023
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 13 tested10 ng/L federal MCL (2024) · US EPAHighest12.2 ng/L
  • CREST HILL12.2 ng/LSample date: 2023-06-12 to 2023-12-28
  • LOCKPORT9.2 ng/LSample date: 2023-12-12 to 2024-08-28
  • CHANNAHONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2025-01-06
  • FRANKFORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • MANHATTANNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • ROMEOVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-13 to 2025-06-09
  • SHOREWOODNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Lead (90th percentile)Detected in 6 systems of 13 tested15 µg/L federal action level · US EPAHighest8.22 µg/L
  • ROMEOVILLE8.22 µg/LMonitoring period: 2025–2025
  • LOCKPORT7.6 µg/LMonitoring period: 2026–2026 (still open)
  • JOLIET6.53 µg/LMonitoring period: 2026–2026 (still open)
  • SHOREWOOD2.3 µg/LMonitoring period: 2026–2028 (still open)
  • CREST HILL1.23 µg/LMonitoring period: 2025–2025
  • FRANKFORT0.981 µg/LMonitoring period: 2023–2025
  • CHANNAHONNot detectedMonitoring period: 2023–2025
  • IL AMERICAN-HOMER TOWNSHIPNot detectedMonitoring period: 2023–2025
  • IL AMERICAN-WEST SUBURBANNot detectedMonitoring period: 2022–2024
  • MANHATTANNot detectedMonitoring period: 2025–2025
  • MOKENANot detectedMonitoring period: 2025–2025
  • NEW LENOXNot detectedMonitoring period: 2023–2025
  • PLAINFIELDNot detectedMonitoring period: 2026–2026 (still open)
Perfluorobutanesulfonic acid (PFBS)Detected in 3 systems of 13 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest52.1 ng/L
  • CREST HILL52.1 ng/LSample date: 2023-06-12 to 2023-12-28
  • CHANNAHON17 ng/LSample date: 2024-06-04 to 2025-01-06
  • LOCKPORT3.2 ng/LSample date: 2023-12-12 to 2024-08-28
  • FRANKFORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • MANHATTANNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • ROMEOVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-13 to 2025-06-09
  • SHOREWOODNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Perfluorohexanoic acid (PFHxA)Detected in 4 systems of 13 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest24.4 ng/L
  • CREST HILL24.4 ng/LSample date: 2023-06-12 to 2023-12-28
  • ROMEOVILLE11.8 ng/LSample date: 2024-06-13 to 2025-06-09
  • CHANNAHON8.6 ng/LSample date: 2024-06-04 to 2025-01-06
  • LOCKPORT4.3 ng/LSample date: 2023-12-12 to 2024-08-28
  • FRANKFORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • MANHATTANNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • SHOREWOODNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
3 more contaminants detectedShow
Perfluorobutanoic acid (PFBA)Detected in 3 systems of 13 testedNo federal or state limit; shown for transparencyHighest27.2 ng/L
  • CREST HILL27.2 ng/LSample date: 2023-06-12 to 2023-12-28
  • CHANNAHON9.9 ng/LSample date: 2024-06-04 to 2025-01-06
  • ROMEOVILLE8.9 ng/LSample date: 2024-06-13 to 2025-06-09
  • FRANKFORTNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • LOCKPORTNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-12-12 to 2024-08-28
  • MANHATTANNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 5.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • SHOREWOODNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 13 testedNo federal or state limit; shown for transparencyHighest13.3 ng/L
  • CREST HILL13.3 ng/LSample date: 2023-06-12 to 2023-12-28
  • CHANNAHONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-04 to 2025-01-06
  • FRANKFORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • LOCKPORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-12-12 to 2024-08-28
  • MANHATTANNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
  • ROMEOVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-13 to 2025-06-09
  • SHOREWOODNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-06 to 2023-08-07
Perfluoropentanoic acid (PFPeA)Detected in 5 systems of 13 testedNo federal or state limit; shown for transparencyHighest32.2 ng/L
  • CREST HILL32.2 ng/LSample date: 2023-06-12 to 2023-12-28
  • ROMEOVILLE21.2 ng/LSample date: 2024-06-13 to 2025-06-09
  • CHANNAHON13 ng/LSample date: 2024-06-04 to 2025-01-06
  • LOCKPORT8.2 ng/LSample date: 2023-12-12 to 2024-08-28
  • SHOREWOOD3.2 ng/LSample date: 2023-02-06 to 2023-08-07
  • FRANKFORTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2023-07-24
  • IL AMERICAN-HOMER TOWNSHIPNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-21 to 2024-08-01
  • IL AMERICAN-WEST SUBURBANNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-02 to 2024-08-08
  • JOLIETNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-08-14
  • MANHATTANNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-06-03 to 2025-12-03
  • MOKENANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-12 to 2025-01-31
  • NEW LENOXNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-28 to 2024-08-29
  • PLAINFIELDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-02 to 2025-09-03
21 PFAS tested, none detected in any systemShow

Tested in these 13 systems: CHANNAHON, CREST HILL, FRANKFORT, IL AMERICAN-HOMER TOWNSHIP, IL AMERICAN-WEST SUBURBAN, JOLIET, LOCKPORT, MANHATTAN, MOKENA, NEW LENOX, PLAINFIELD, ROMEOVILLE, SHOREWOOD

  • 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)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 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)
  • 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)
13 cities

Cities ranked by the records

Showing 6 of 13 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 Will County2 of 13 city reports had a PFAS sample above a 2024 EPA limit
  1. Channahon5.9 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Illinois
Lead

0of 13 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 Illinois
Who supplies the county

Largest water systems

  1. JolietJOLIET · IL1970450
    160,000 served
  2. BolingbrookIL AMERICAN-WEST SUBURBAN · IL1974151
    73,978 served
  3. RomeovilleROMEOVILLE · IL1970900
    50,458 served
  4. PlainfieldPLAINFIELD · IL1970800
    50,000 served
  5. New LenoxNEW LENOX · IL1970700
    29,200 served
  6. Homer GlenIL AMERICAN-HOMER TOWNSHIP · IL1970100
    24,543 served
  7. FrankfortFRANKFORT · IL1970400
    24,000 served
  8. LockportLOCKPORT · IL1970500
    23,100 served
  9. Crest HillCREST HILL · IL1970250
    20,223 served
  10. MokenaMOKENA · IL1970600
    19,887 served
Questions

Frequently asked

How does Will County tap water compare across cities?

PurityMap ranks 13 cities in Will 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 Bolingbrook's main water system: IL AMERICAN-WEST SUBURBAN · PWSID IL1974151 · Purity Score 100 (Excellent) · Confidence: moderate · 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 Will County cities had a PFAS sample above a 2024 EPA limit?

2 of 13 Will County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Crest Hill (PFOA 13.7 ng/L), Channahon (PFOS 5.9 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 5.

Is there lead in Will County tap water?

Utilities report lead as a 90th-percentile result from home taps. 6 of 13 Will 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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