Decatur Water System water quality
Decatur, IL · serves 76,122 people (31,407 connections) · Surface water · Local government · EPA ID IL1150150
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data.
- PFAS
- Not detectedNone of 29 PFAS found above EPA's reporting limits in 4 samples (2023–2025).
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2025. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Decatur Water System's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (217) 424-2863. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 1 entry point tested Feb 2024 to Nov 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 0 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 4 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jul 2025 – Dec 2025). Below action level
Highest since 2016: 2.6 ppb (Dec 2025).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jul 2025 – Dec 2025 | 0 ppb |
| Jan 2025 – Dec 2025 | 2.6 ppb |
| Jan 2025 – Jun 2025 | 0 ppb |
Earlier results (9)
| Jan 2021 – Dec 2023 | 1.6 ppb |
| Jan 2018 – Dec 2020 | 2.2 ppb |
| Jan 2015 – Dec 2017 | 0 ppb |
| Jan 2012 – Dec 2014 | 3.1 ppb |
| Jan 2009 – Dec 2011 | 7.9 ppb |
| Jan 2006 – Dec 2008 | 3 ppb |
| Jan 2003 – Dec 2005 | 3.5 ppb |
| Jan 2000 – Dec 2002 | 0 ppb |
| Jan 1999 – Dec 1999 | 0 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Chromium-6 | 2.05 ppb | – |
| Strontium | 0.085 ppm | 1.5 ppm |
| Molybdenum | 1.07 ppb | 40 ppb |
| Vanadium | 1.39 ppb | 21 ppb |
| Chlorate | 179 ppb | 210 ppb |
Where it serves
ZIP codes the system reported serving: 62521, 62522, 62523, 62525, 62526
Nearby utilities
- Illinois American Water – Lincoln Lincoln · 31 mi · PFAS above limit
- Springfield Water System Springfield · 38 mi
- Illinois American Water – Champaign Champaign · 39 mi
- Bloomington Water System Bloomington · 43 mi
- Normal Water System Normal · 46 mi
- Illinois American Water – Peoria Peoria · 72 mi · PFAS above limit
Questions
Is Decatur Water System water safe to drink?
Decatur Water System has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Decatur Water System water have PFAS?
EPA tested Decatur Water System for 29 PFAS between Feb 2024 and Nov 2024 and none were detected above the reporting limits (about 2 to 20 ppt depending on the chemical).
What is the lead level in Decatur Water System water?
The most recent 90th-percentile lead result for Decatur Water System is 0 ppb, for the period ending Dec 2025. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for IL1150150: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID IL1150150).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Decatur Water System at (217) 424-2863, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.