'Usually those calls are nothing we are too concerned about,' Chelsea Lindsey, the agency's communication specialist, told
WTOP.
'Normally we deal with smaller snakes [in toilets] like wild snake or ball pythons, but we discovered it wasn't a python - it was a yellow anaconda.'
The anaconda, which the officers named 'Sir Hiss', was safely removed from the toilet and no one was injured.
Lindsey said the snake was not aggressive, but actually scared of the situation.
'He is a more unusual, larger type of snake,' she said. 'But he wasn't going around trying to eat people.'
The Animal Welfare League of Arlington (AWLA) is investigating how the snake ended up in the toilet.
Lindsey believes the anaconda was likely abandoned by its owner and then went into the toilet seeking rats or mice to eat.
'We don't want people thinking there was an anaconda outside that came inside,' she said.