What Role Do Plumbing Materials and Age Play in Bacteria Concerns?
While the source water for Joliet's public water system comes from groundwater, bacteria issues in a private household's water can also relate to the materials and age of plumbing within the home. Older pipes made from certain materials may have biofilms or small corrosion that encourage bacterial growth independent of the water source. Therefore, even if the public water system maintains bacterial standards, a home's internal plumbing may influence bacteria presence.
What Happens If Bacteria in Water Are Left Untreated Over Years?
Water containing bacteria, if untreated over long periods, can lead to unpleasant tastes and odors and encourage the growth of biofilms that may cause staining or clogging in plumbing fixtures. While not all bacteria detected cause illness, some types can pose health risks, especially to sensitive individuals. Continuous exposure to untreated bacterial contamination might require more extensive plumbing cleaning or replacement down the line.
How Do Public Water System Records Differ from Private Well Testing?
Joliet’s public water system serves approximately 160,000 people through about 49,000 connections and uses groundwater as its source. The Environmental Protection Agency records show two health-based violations on the public system’s record, although these do not specifically measure bacteria at each household’s tap. Public system data reflects compliance and system-wide conditions, whereas private well testing is necessary to determine bacteria levels specific to an individual home's water supply. Testing your own water is the only way to confirm bacteria presence in your household supply.
What Changes About Bacteria Concerns for Large or Seasonal Households?
Large households or seasonal properties in Joliet may experience different water usage patterns, affecting how bacteria develop in plumbing systems. Extended periods without water flow, common in seasonal homes, can increase the chance of bacterial growth within pipes. Larger homes with complex plumbing may have more areas where bacteria can stabilize. Regular testing and appropriate water treatment become especially important in these contexts to maintain water quality.
How Does Bacteria Enter Groundwater or the Distribution System in Joliet?
Bacteria can enter Joliet’s groundwater source through various pathways including surface runoff, infiltration from septic or sewer systems, or other environmental sources. As groundwater is pumped into the distribution system, treatment processes aim to reduce bacterial levels to protect public health. However, occasional detections may still occur in the distribution network. The Joliet system uses a multi-step treatment process to manage bacteria but does not guarantee zero bacteria at every tap.
What You Should NOT Conclude from Joliet Area Bacteria Data
Government records offer valuable insight into the general quality of Joliet’s water system, but these data cannot confirm the quality of water inside any particular home. The presence of bacteria in public water system reports or detections does not automatically mean your water is unsafe or in violation of health standards. Conversely, a clean public system record does not rule out bacteria problems originating from private plumbing or private wells. Testing and appropriate treatment remain essential for household assurance. The Autotrol Bacteria & Coliform (Well) Filter ships ready to configure to provide targeted reduction of bacteria and coliforms once a problem is confirmed by testing.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2026-06-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for JOLIET (IL1970450), groundwater supply, serving 160000 people: 2 health-based violations of 15 total; lead 90th percentile 0.00647 mg/L