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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).

Current safety parameters for E. coli

Activity

Safe E. coli

Swimming

Water < 550

Gather pipi to eat

Water < 14

Gather pipi to eat

Pipi < 2.3

Safe level to gather shellfish

Current level


Results

2021

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 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

2022

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 CFU)

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

30 Nov 22

221

14

8 Dec 22

92

14

15 Dec 22

328

14

29 Dec 22

695

14

2023

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 CFU)

5 Jan 23

393

14

19 Jan 23

312

14

1 Feb 23

828

14

15 Feb 23

1194

14

1 Mar 23

1833

14

18 Mar 23

1355

14

29 Mar 23

722

14

1 June 23

470

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

Results

2021

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 CFU)

17 Aug 21

110

2.3

1 Sept 21

110

2.3

9 Sept 21

78

2.3

24 Sept 21

1300

2.3

29 Sept 21

110

2.3

1 Oct 21

330

2.3

19 Oct 21

16000

2.3

26 Oct 21

230

2.3

2 Nov 21

1300

2.3

17 Nov 21

80

2.3

25 Nov 21

80

2.3

30 Nov 21

330

2.3

9 Dec 21

80

2.3

15 Dec 21

1300

2.3

2022

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 CFU)

13 Jan 22

140

2.3

28 Jan 22

145

2.3

4 Feb 22

182

2.3

11 Feb 22

290

2.3

19 Feb 22

122

2.3

25 Feb 22

178

2.3

5 Mar 22

106

2.3

12 Mar 22

278

2.3

18 Mar 22

63

2.3

25 Mar 22

722

2.3

1 Apr 22

294

2.3

8 Apr 22

364

2.3

15 Apr 22

220

2.3

22 Apr 22

436

2.3

29 Apr 22

248

2.3

6 May 22

107

2.3

13 May 22

128

2.3

19 May 22

39

2.3

26 May 22

259

2.3

2 Jun 22

501

2.3

9 Jun 22

1263

2.3

16 Jun 22

276

2.3

23 Jun 22

184

2.3

30 Jun 22

59

2.3

7 Jul 22

480

2.3

14 Jul 22

180

2.3

28 Jul 22

2300

2.3

4 Aug 22

1506

2.3

11 Aug 22

327

2.3

18 Aug 22

95

2.3

24 Aug 22

492

2.3

1 Sept 22

320

2.3

8 Sept 22

408

2.3

22 Sept 22

790

2.3

28 Sept 22

225

2.3

6 Oct 22

78

2.3

13 Oct 22

212

2.3

20 Oct 22

205

2.3

27 Oct 22

122

2.3

6 Nov 22

98

2.3

10 Nov 22

240

2.3

17 Nov 22

692

2.3

25 Nov 22

1250

2.3

30 Nov 22

97

2.3

8 Dec 22

295

2.3

15 Dec 22

75

2.3

22 Dec 22

210

2.3

29 Dec 22

359

2.3

2023

Date
(oldest to newest)

E. coli
(in CFU/100ml)

Safe to gather shellfish 
(<15 CFU)

05 Jan 23

199

2.3

19 Jan 23

82

2.3

1 Feb 23

250

2.3

15 Feb 23

193

2.3

1 Mar 23

285

2.3

18 Mar 23

152

2.3

29 Mar 23

35

2.3

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