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IL American - Clarendon

What EPA’s and Illinois’s records show in this utility’s water: PFAS and lithium; nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
625 people
Connections
249
Water source
Groundwater
Based in
Godfrey, IL
County
Dupage
Owner
Private
Hardness
Very hard
The ZIP code it serves

60514

The short answer

1 result is above the health goal, and 1 more is above EPA’s health benchmark. The worst: Lithium, above EPA’s health benchmark. 1 health-based violation since 2016.

What handles it

What was found

PFAS and lithium: EPA UCMR 5, samples taken from June 4, 2024 to Dec. 3, 2024.

Arsenic, total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate and chromium (total): Illinois’s own results, samples taken from Aug. 13, 2020 to Sept. 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

PFAS: None of the six PFAS in EPA’s 2024 drinking water rule was found in this utility’s samples. None of the other 23 PFAS tested for was found either.

EPA’s 2024 PFAS rule, compound by compound

PFASEPA’s limitResult
PFOA4.0 pptNot foundNot found in any of 2 samples, below 4 ppt
PFOS4.0 pptNot foundNot found in any of 2 samples, below 4 ppt
PFHxS10 pptNot foundNot found in any of 2 samples, below 3 ppt
PFNA10 pptNot foundNot found in any of 2 samples, below 4 ppt
HFPO-DA (GenX)10 pptNot foundNot found in any of 2 samples, below 5 ppt
PFBSIndex onlyNot foundNot found in any of 2 samples, below 3 ppt
Hazard IndexPFHxS, PFNA, HFPO-DA and PFBS together1Doesn’t applyDoesn’t apply: no sampling location found two or more of the four
Results from EPA’s UCMR 5 sampling. “Below” is the lab’s reporting level: a result under it reads as not found, which is not the same as zero. The limits are EPA’s 2024 rule, with compliance due from 2029; EPA has since proposed changes to some of them, explained on each compound’s page. PFBS has no limit of its own and counts only toward the Hazard Index, which adds up the four, each against EPA’s health-based level, from each sampling location’s average, as EPA’s UCMR 5 summary does. It counts only where two or more of the four were found, and is above the limit from 1.5.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

2.1ppb

Highest yearly average, 2021 to 2024

2024, one sample: 1.9 ppb

Averaged by year, the highest was 2.1 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2024, the latest year on file, its one sample was 1.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.6 ppb, in 2012.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Above EPA’s health benchmark1

Lithium

Comes from the source

Above EPA’s health benchmark

42ppb

Highest sample, Dec. 3, 2024; found in 2 of 2

The highest sample was 42 ppb, about 4.2 times EPA’s health reference level of 10 ppb. That is a screening level, not an enforceable limit.

What handles it

No certification claim covers this compound yet.

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

31ppb

Highest yearly average, 2020 to 2026

2026 average: 23.5 ppb

Averaged by year, the highest was 31 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 40.1 ppb. In 2026, the latest year on file, its two samples averaged 23.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 11.6 ppb, in 2019.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.81ppm

Highest yearly average, 2021 to 2024

2024, one sample: 0.81 ppm

Averaged by year, the highest was 0.81 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2024, the latest year on file, its one sample was 0.81 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.4 ppm, in 2015.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

11.2ppb

Highest yearly average, 2020 to 2026

2026 average: 4.6 ppb

Averaged by year, the highest was 11.2 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its two samples averaged 4.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.4 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.13ppm

Highest sample; found in 1 of 7

2026: not found

The highest sample, in 2021, was 0.13 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Illinois utilities above EPA’s PFAS limits
31 compounds tested and not foundIncluding all six PFAS in EPA’s 2024 rule. Below the reporting level in every sample. Not found is not the same as zero.

From routine monitoring

  • Chromium (total)
  • Lead

PFAS and lithium, from EPA’s UCMR 5 sampling

  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • HFPO-DA (GenX)
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFBA
  • PFBS
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpA
  • PFHpS
  • PFHxA
  • PFHxS
  • PFMBA
  • PFMPA
  • PFNA
  • PFOA
  • PFOS
  • PFPeA
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best reverse osmosis systems, ranked

Hardness

Very hard, 690 mg/L (40.4 grains per gallon), at its one sampling point, 2019 to 2025.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 40.4 grains per gallon, salt includedSoftener or salt-free conditioner?Illinois water hardness, utility by utility

Disinfectant

IL American - Clarendon reported disinfecting with chlorine, not chloramine, at its one sampling point, in its 2024 sampling for EPA.

Chlorine leaves water that sits out for a few days, CDC says. A filter certified for it carries a chlorine claim under NSF/ANSI 42; a shower filter, a free chlorine claim under NSF/ANSI 177. This is what the utility reported for that sampling. Its annual water quality report says what it uses now.

Chlorine vs. chloramineShower filters, by what their listings cover

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 1 monitoring or reporting violation not shown.

What this report can’t tell you

  • Everything else. Arsenic, total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate and chromium (total) results here are Illinois’s own from 2020 on, with EPA’s national file for 2012 to 2019. IL American - Clarendon’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 samples are from June 4, 2024 to Dec. 3, 2024; Illinois’s results run from Aug. 13, 2020 to Sept. 1, 2026.

Testing your own tap

IL American - Clarendon’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Illinois certifies.

The 3 labs Illinois certifies closest to the area IL American - Clarendon serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • ETP Labs, Inc.

    Willowbrook, IL · about 4 miles

    Certified for bacteria

    (630) 891-3392

  • DuPage County Health Department

    Wheaton, IL · about 9 miles

    Certified for bacteria

    (630) 221-7177

  • Phigenics Analytical Services Laboratory

    Warrenville, IL · about 11 miles

    Certified for bacteria

    (844) 850-4087

Illinois Department of Public Health: Coliform bacteria and nitrate testing for private wells, with sample bottles from your local health department, or from the department's nearest regional office where there is none. You mail the sample to the lab, and results come back through the health department. Well Sampling for Coliform & Nitrate, Illinois Department of Public Health.

All 30 certified labs for Illinois

Sources

PWSID IL0435300. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in DuPage County

All Illinois utilities

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