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Mentone Beach

Montone drains map 

A summary of the results for all beach drains between December 2018 to May 2019 is available on the results page and for Mentone below the table. Below is a table of drain flows since the start of monitoring, updated monthly.


Type of monitoring 

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 Community reports between Dec 2018 - May 2019

 Were dry weather flows detected on regular days/times?

Number of days drain flowing between Dec 2018 - May 2019  Number of medium-high flow reports between Dec 2018 - May 2019 

Naples Road drain

Drain located at Naples Road- Mentone

Citizen science volunteers

 Community reports at drain sign


41 7

Low number of small-sized dry weather flows with ammonia detected between Dec 2018-May 2019. This drain had highest number of reports for small flows entering Bay. June sampling will try to confirm type and level of pollution to Bay.

Marina Road drain

 Drain located at Marina Road- Mentone

Citizen science volunteers

7 0

Low number of reports received. Only one small-sized dry weather flow detected (observed as a trickle) between Dec 2018-May 2019.

Summary of Mentone results - December 2018 to March 2019

Mentone Beach has had a high level of reporting, with 90 per cent of these reports submitted by trained citizen science volunteers. Active volunteers at Mentone have mostly submitted more than one report, with two volunteers submitting 12 reports and 16 reports respectively! The main findings so far are:


  • Mentone drains flow regularly, with 94 per cent of reports showing drains flowing, although most of these were small flows. The focus of this project has been to target regular medium to large flows, but will switch to following up on small flows as no regular medium or large flows are being detected.
  • Naples Road drain has shown flows not related to rainfall, so if more of these flows are detected, EPA sampling will occur so we confirm the type and extent of pollution.
  • Marina Road drain has only shown flows during rainfall.
  • One medium sized dry weather flow was detected at Naples Road, all other medium to large flows at this drain have been during or after rain.

Ammonia levels:

  • When our trained citizen scientists observe a drain flowing, they perform a simple test for ammonia. Ammonia can be used as a proxy for faecal pollution, as animals excrete ammonia in waste, but it can also indicate other pollution such as detergents or fertilizer. Concentration of ammonia can also vary depending on size of flow and dilution in the drain system.
  • Ammonia results at Mentone are varied, ranging from 0 to 8 mg/L (higher levels during rain), with ammonia detected in only 12% of dry weather flows and at low levels (e.g. 0.25 mg/L). Follow-up sampling will confirm if microbial levels are low at these ammonia concentrations (i.e. do low ammonia levels mean low microbial levels in drain flows).

All this data helps EPA gather a better understanding of stormwater flows affecting Mentone Beach. Reports were collected until the end of May 2019 and begin again in late 2019.

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