The Monster Slide was set up on Devon St in New Plymouth on March 1.

The Monster Slide event on the main street of New Plymouth is being investigated because of "foamy water" pollution.

According to the Taranaki Regional Council incident register, tabled at the consents and regulatory meeting this week, enforcement action is being considered against the slide's operator Jamie Templeton because "foamy water" got into the stormwater drains.

The Monster Slide came to New Plymouth's Devon St on March 1 as part of a nationwide tour and despite issues at other centres went off without a hitch until now.

TRC resource management director Fred McLay said no consent was sought by Templeton for the slide which meant he did not have the right to discharge anything but water to stormwater drains or waterways.

"The slide was inspected while it was operating. Samples revealed that low levels of detergent were entering a stormwater drain and thence the Huatoki Stream," McLay said.

"The council followed Resource Management Act procedures in issuing an inspection notice and making a formal request for a written explanation for non-compliance with the RMA within 14 days."

However, when contacted for comment Templeton said he knew nothing of the issue and had not received any contact or letter from the council.

"This is the first time we have heard of this, we have not received a letter and therefore cannot comment until such time as we receive it and have the opportunity to peruse it," he said.

Templeton said he was interested in seeing test results given the stormwater drains were "covered off as required in our permit."

The TRC could not confirm the date it sent Templeton the letter.