ENWIN Utilities Ltd. is urging Windsor residents not to be alarmed if they see green water emerging from drainage areas in the city. The discoloration is the result of a harmless dye used in routine infrastructure testing, according to the utility company.
What Causes the Green Water?
The green tint comes from a non-toxic fluorescent dye that ENWIN adds to water during inspections of storm and sanitary sewer systems. The dye helps technicians track water flow, identify leaks, and assess pipe connections. ENWIN assures the public that the dye is safe and poses no risk to health or the environment.
“We understand that seeing coloured water can be concerning, but this is a standard practice in utility maintenance,” said an ENWIN spokesperson. “The dye is biodegradable and used in very low concentrations.”
When and Where to Expect It
Testing typically occurs during dry weather when flow is minimal, allowing for accurate readings. Residents may notice green water in street gutters, catch basins, or other drainage points. The colour usually dissipates within a few hours as the dye disperses.
ENWIN advises that the green water is not a sign of contamination or a chemical spill. The utility company coordinates with municipal authorities to ensure testing is conducted safely and with minimal disruption.
Public Reassurance and Safety
ENWIN emphasizes that drinking water remains unaffected. The dye is used exclusively in the stormwater and wastewater systems, which are separate from the potable water supply. Residents do not need to take any action or report sightings, unless the green water persists for more than 24 hours or enters private property in unusual quantities.
“If you see green water, there’s no need to call 911 or emergency services,” the spokesperson added. “It’s a routine part of keeping our infrastructure reliable.”
Background on Infrastructure Testing
Windsor’s aging sewer systems require regular inspection to prevent backups and overflows. Fluorescent dye testing is a cost-effective method widely used across North America. Similar tests have been conducted in other Ontario municipalities without incident.
ENWIN plans to continue these tests periodically and will notify the public through local media and social media when large-scale testing is scheduled. For now, residents are asked to simply note the occurrence and carry on with their day.
