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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 level to gather shellfish

Current level


Date E. coli (CFU)
Unsafe to gather
shellfish above
14 CFU
19 Oct 21  2500 14
26 Oct 21  300 14
2 Nov 21  190 14
17 Nov 21  120 14
30 Nov 21  100 14
16 Dec 21  2200 14
13 Jan 22  50 14
28 Jan 22  210 14
4 Feb 22  398 14
11 Feb 22   540 14
19 Feb 22   380 14
25 Feb 22  460 14
4 Mar 22   290 14
11 Mar 22   285 14
18 Mar 22  120 14
25 Mar 22  580 14
1 Apr 22   187 14
8 Apr 22  360 14
15 Apr 22  245 14
22 Apr 22  642 14
29 Apr 22  480 14
6 May 22  680 14
13 May 22  120 14
19 May 22  752 14
26 May 22  435 14
2 Jun 22  309 14
9 Jun 22  1092 14
16 Jun 22  540 14
23 Jun 22  209 14
30 Jun 22  220 14
7 Jul 22  1360 14
14 Jul 22  340 14
28 Jul 22 1200 14
4 Aug 22 590 14
11 Aug 22 672 14
18 Aug 22 95 14
24 Aug 22 590 14
1 Sept 22 275 14
8 Sept 22 621 14
22 Sept 22 390 14
28 Sept 22 523 14
6 Oct 22 1103 14
13 Oct 22 340 14
20 Oct 22 175 14
27 Oct 22 270 14
6 Nov 22 421 14
10 Nov 22 1100 14
17 Nov 22 692 14
25 Nov 22 1250 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


DatePipi by CFU

Unsafe to eat
(above 2.3)
17 Aug 21 1102.3
1 Sept 21 1102.3
9 Sept 21 782.3
24 Sept 21 13002.3
29 Sept 21 1102.3
1 Oct 21 3302.3
19 Oct 21 160002.3
26 Oct 21 2302.3
2 Nov 21 13002.3
17 Nov 21 802.3
25 Nov 21 802.3
30 Nov 21 3302.3
9 Dec 21 802.3
15 Dec 21 13002.3
13 Jan 21 1402.3
28 Jan 21 1452.3
4 Feb 22 1822.3
11 Feb 22 2902.3
19 Feb 22 1222.3
25 Feb 22 1782.3
5 Mar 22 1062.3
12 Mar 22 2782.3
18 Mar 22 632.3
25 Mar 22 7222.3
1 Apr 22 2942.3
8 Apr 22 3642.3
15 Apr 22 2202.3
22 Apr 22 4362.3
29 Apr 22 2482.3
6 May 22 1072.3
13 May 22 1282.3
19 May 22 392.3
26 May 22 2592.3
2 Jun 22 5012.3
9 Jun 22 12632.3
16 Jun 22 2762.3
23 Jun 22 1842.3
30 Jun 22 592.3
7 Jul 22 4802.3
14 Jul 22 1802.3
28 Jul 2223002.3
4 Aug 2215062.3
11 Aug 223272.3
18 Aug 22952.3
24 Aug 224922.3
1 Sept 223202.3
8 Sept 224082.3
22 Sept 227902.3
28 Sept 222252.3
6 Oct 22782.3
13 Oct 222122.3
20 Oct 222052.3
27 Oct 221222.3
6 Nov 22982.3
10 Nov 222402.3
17 Nov 226922.3
25 Nov 2212502.3