Derbyshire police said they took the action after getting reports people were gathering at the spot, known locally as the 'Blue Lagoon'.
The move drew mixed responses, with many people commenting that by adding the black dye, people may be drawn to the water which many weren't aware of and now looked even more eye-catching.
The team from Bruxton police station in Derbyshire in central England posted on Facebook they had reports of people congregating at "Blue Lagoon", an old quarry made famous among locals for its toxic but sparkling bright blue water. So police regularly dye the water to prevent people from swimming in it.
Some officers wore white overalls, masks and blue gloves as they dyed the water.
"The location is risky and this type of gathering is in contravention of the current instruction of the UK Government", Officers in Buxton, a small town in Derbyshire in central England, wrote on Facebook.
"However, the location is unsafe and this type of gathering is in contravention of the current instruction of the UK Government".
So rather than continually going out to the water spot to hand out fines, police decided to make it look less appealing.
"The photos below show our efforts this morning.and yes we did laugh at PC Parkinson and PCSO Small in the white suits!" the department said, adding: "Please stay at home".
In addition to high PH levels, the water reportedly is very cold and has trash and dead animals in it.
Derbyshire police said adding dye is a "regular tactic" done in partnership with the High Peak Borough Council and Derbyshire Fire and Rescue Service to keep crowds away from the glimmering waters.
"As things stand, it has never been so important to discourage these types of gatherings". As of Sunday there were at least 19,772 confirmed cases and 1,228 deaths, according to Johns Hopkins University.