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Shellfish gathering waters

For marine/salt water influenced waters there is currently no legislated safe swimming limit. Councils vary in their monitoring methodologies between faecal coliforms and Enterococci. Because E. coli is one of 4-5 bacteria that make up the faecal coliform group, Wai Kōkopu monitors E. coli at marine/salt water influenced sites.

Our reasoning for using this method is that E. coli monitoring, in addition to the Regional Council’s monitoring scheme, may allow for a better understanding of the sources of faecal pollution and public health risks. (Microbiological Water Quality Guidelines (MfE, 2003)).

Our safety limits for shellfish flesh and shellfish gathering waters are based on those set out in the Regulated Control Scheme - Bivalve Molluscan Shellfish for Human Consumption (2021).

Safe to gather shellfish

Current level


+
Date
(oldest to
newest)
E. coli
(CFU)
Unsafe to collect shellfish 
(above 14 CFU)
9 Jun 22  1649  14
16 Jun 22  780  14
23 Jun 22  542  14
30 Jun 22  350  14
7 Jul 22  1090  14
14 Jul 22  520  14
28 Jul 22 1780 14
4 Aug 22 1910 14
11 Aug 22 896 14
18 Aug 22 376 14
24 Aug 22 396 14
1 Sept 22 280 14
8 Sept 22 682 14
22 Sept 22 590 14
29 Sept 22 430 14
6 Oct 22 329 14
13 Oct 22 795 14
20 Oct 22 320 14
27 Oct 22 418 14
6 Nov 22 309 14
10 Nov 22 978 14
17 Nov 22 590 14
25 Nov 22 1535 14

Shellfish

To be considered safe shellfish must contain less than 230 E. coli CFU/100 g (or 2.3 E. coli CFU/g) and the surrounding waters less than 14 E. coli MPN/100 ml.

Safe level to eat shellfish

Current level

Date
(oldest to
newest)
Pipi by CFU

Unsafe to eat
(above 2.3)


9 Jun 22  1511 2.3

16 Jun 22  309 2.3
23 Jun 22  274 2.3
30 Jun 22  102 2.3
7 Jul 22  309 2.3
14 Jul 22  163 2.3
28 Jul 22 3120 2.3
4 Aug 22 1680 2.3
11 Aug 22 415 2.3
18 Aug 22 130 2.3
24 Aug 22 780 2.3
1 Sept 22 130 2.3
8 Sept 22 275 2.3
22 Sept 22 531 2.3
29 Sept 22 129 2.3
6 Oct 22 107 14
20 Oct 22 78 2.3
27 Oct 22 370 2.3
6 Nov 22 176 14
10 Nov 22 312 2.3
17 Nov 22 350 2.3
25 Nov 22 478 2.3