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What Government Sampling Shows for Madison's Water System

Public Water System Record Overview

The Madison Water Utility, serving Dane County residents, supplied water from groundwater sources to over 270,000 people through more than 100,000 connections. Federal unregulated contaminant monitoring (UCMR3) from 2013 to 2015 tested for volatile organic compounds (VOCs) but found no results exceeding federal maximum contaminant levels (MCLs), indicating that no VOCs were identified at levels regulated for health concerns in this public system.

Why Volatility in Water Compounds Matters

Exposure Routes Beyond Drinking

Volatile organic compounds (VOCs), also called volatile organics or solvent compounds, can enter the body not only by drinking water but also through inhalation during showering or dishwashing. These activities release VOCs into the air, increasing household exposure. Understanding these routes helps households recognize why VOCs in water merit attention even if drinking water tests appear within safe ranges.

Showering and Household Air Quality

Activities like showering can vaporize VOCs, contributing to indoor air quality concerns. Residents concerned about VOC presence should consider this inhalation aspect in addition to ingestion.

Which VOCs Appear in Madison's UCMR3 Data and Which Do Not

Detected Compounds

• 1,1-dichloroethane was detected in 2 out of 44 tests, with measurements up to 0.08 micrograms per liter (µg/L), equivalent to 0.08 parts per billion (ppb).

Non-Detected Compounds

• Chloromethane showed no detections above a reporting level of 0.2 µg/L.
• Bromomethane showed no detections above 0.2 µg/L.
• HCFC-22, Halon 1011, 1,3-butadiene, and MTBE also had no detected results above their respective reporting levels in this dataset.

Differences Between Public Water Records and Private Well Testing

System-Wide Data Versus Individual Water Quality

The data reflects averaged monitoring results for the entire Madison Water Utility system rather than individual residences. Only water tests performed on a home's own supply can establish specific VOC levels in that household’s water supply.

Limits of Regional Data

Public system data help outline broad regional conditions but do not substitute for a home's water quality test results, which are the authoritative source to detect any VOC presence specific to that household.

Distinguishing VOCs from Similar Water Issues

VOCs Versus Other Water Concerns

Volatile organic compounds differ from common water quality issues such as mineral hardness, iron staining, or microbial contamination. VOCs are chemical solvents that volatilize, while minerals and microorganisms remain dissolved or suspended without volatility.

Health Versus Aesthetic Standards

Unlike some aesthetic water standards for taste or odor, VOC monitoring relates to potential chemical exposure. However, the Madison system's records do not show VOC levels exceeding health-based regulations.

Seasonal and Multi-Year Variability in VOC Monitoring

Monitoring Timeline

Data was collected over multiple years from May 22, 2002, to December 29, 2015, with focused sampling under the UCMR3 program between 2013 and 2015. This long-term monitoring helps capture variations in VOC presence over time.

Fluctuations in Detections

While isolated detections of 1,1-dichloroethane occurred, consistent results did not indicate persistent or elevated levels during this period. Other VOCs remained below detection thresholds.

What Not to Conclude from Madison Area VOC Data

These regional water system results should not be taken as definitive evidence of VOC concentrations in any single household's water. Detecting a compound in public system monitoring is a measurement, not a violation or a health finding. Testing of the specific home's water supply is essential to confirm individual water quality. Also, the absence of detections for many VOCs means no measurement above reporting levels was recorded, but it does not establish absolute absence in any one home.

How to Address VOC Concerns at Home

Households seeking to manage potential VOC and industrial chemical issues can consider water treatment options such as the Fleck VOCs & Industrial Chemicals Filter. This system ships ready to configure and is designed to reduce a range of volatile organics and solvent compounds from water supplies after confirming individual water conditions through testing.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-12-29. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Madison Water Utility (WI1130224), WI: 300 results across 7 listed contaminants, 2 detections above the reporting level; no federal MCL for these UCMR-listed VOCs