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Calhoun County RWDwater quality report, rewritten

Serves
4,675
Connections
1,771
Water source
Groundwater
Based in
Hardin, IL
County
Calhoun
Owner
Local government

ZIP codes served: 62006, 62013, 62036, 62045, 62047, 62053, 62062, 62065, 62070, 62355, 62361

PWSID IL01300102026 edition · EPA data

Read this first

  • Lithium was found in two of 2 samples, highest 36 ppb. Above EPA’s health reference level of 10 ppb, a screening level rather than an enforceable limit.
  • Lead The 90th-percentile result was 4.5 ppb, below the 15 ppb action level. EPA’s health goal for lead is zero.

1 health-based violation since 2016. Details are below.

What handles it

What was found

Highlighted: above the health goal. Circled: above the legal limit in at least one sample. Every scale puts the legal line at its middle.

Lithium

Comes from the source

36ppb

Highest of 2 samples; found in two

Above EPA’s health reference level of 10 ppb, a screening level rather than an enforceable limit.

What handles it

No certification claim covers this compound yet.

EPA UCMR 5, samples taken from June 18, 2025 to Nov. 3, 2025. Each blue tick is one sample where it was found.

Lead

Comes from pipes, often your own

4.5ppb

90th percentile, 2025

The 90th-percentile result was 4.5 ppb, below the 15 ppb action level. EPA’s health goal for lead is zero.

What handles it

EPA SDWIS, lead and copper monitoring periods ending 2006 to 2025. The pointer marks the latest period; each blue tick is an earlier one.

Tested and not found

Below EPA’s minimum reporting level in every sample taken from June 18, 2025 to Nov. 3, 2025. Not found means not measured above that level, which is not the same as zero.

  • 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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
TTHMMaximum Contaminant Level Violation, AverageJuly 1, 2020 to Sept. 30, 20200.082 MG/LResolved
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 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.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Compare five-year costs

Filters with those claims on a certifier’s listing

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

What this report cannot tell you

  • Levels of everything else. Federal bulk data carries results for PFAS, lithium, lead and copper, and violations for the rest. Nitrate, arsenic, disinfection byproducts and other levels are in Calhoun County RWD’s own annual report, which it must send you every year.
  • 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.
  • Anything after the latest data. SDWIS data is from 2026 Q2; UCMR 5 samples are from June 18, 2025 to Nov. 3, 2025.

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Sources