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Wigmore Stream Water Quality

TCDC has agreed to provide Hahei Residents and Ratepayers Association with water quality test results from the Wigmore Estuary on a  regular basis.

Here is a copy of the agreement, HRRA TCDC Water Testing MOU

Samples are taken monthly except over the busy holiday season when they are taken weekly.

They are taken from the estuary of the Wigmore Stream as shown in the here

A summary of the results of these tests is shown below.

Date E. Coli Enterococci Ammoniacal Nitrogen (as N) mg/l Weather Prior to Sample/Comments
2021/02/19 210 360 0.077 70mm rain 15 Feb. Quiet in Village
2021/01/20 28 21 0.028 No rain. Busy holiday season
2021/01/25 120 120 0.051 No rain. Busy holiday season
2021/01/20 90 96 0.041 6mm rain morning 20 Jan. Busy holiday season
2021/01/14 240 330 0.25 No rain. Busy holiday season
2021/01/06 510 350 1.1 40mm Rain 3 Jan, then dry hot weather. Busy holiday season
2020/12/31 25 2 0.151 No Rain. Last rain on 24 Dec. Busy
2020/12/22 98 110 0.037 LIght rain (8mm) on sample day
2020/12/16 25 21 0.31 No rain, last rain (20mm) on 10 Dec
2020/10/05 11 5 0.044 No rain
2020/09/07 1,800 3,000 0.1 Raining day of sample
2020/08/28 460 30 0.2 Heavy Rain (43mm) on 23 Aug
2020/07/15 240 130 0.1 Light Rain on 6 July. No more prior to sample
2020/06/17 390 540 0.1 Light Rain on 17 June. No more prior to sample
2020/05/28 1,400 480 <0.4 Heavy Rain (43mm) on 23 Aug
2020/04/01 330 350 0.1
2020/03/12 64 8 0
2020/02/11 44 7 0
2020/02/03 <1.6 <1.6 0.1
2020/01/28 28 15 0
2020/01/22 63 31 0.1
2020/01/11 18 2 0.5
2020/01/03 18 72 0
2019/12/23 78 200 0
2019/12/19 290 570 0
2019/12/05 580 520 0.4
2019/11/13 <1.6 25 0.2
2019/10/16 2,000 200 0.1
2019/09/11 770 260 0.1
2019/08/19 42 33 0
2019/07/08 94 220 0
2019/06/12 220 350 0.1
2019/06/07 18 52 <0.005
2019/04/11 620 2,700 1.1
2019/04/04 68 200 <0.4
2019/02/28 350 150 0
2019/02/20 25 16 0
2019/02/14 270 94 0
2019/02/07 25 5 0
2019/02/03 68 200 <0.4
2019/01/30 140 72 0
2019/01/22 92 10 <0.4
2019/01/14 2,600 340 <0.4
2019/01/08 2 7 <0.4
2019/01/02 230 300 1
2018/12/27 210 180 <0.4
2018/12/19 1,300 510 0
2018/11/15 150 170 <0.4
2018/10/17 94 260 <0.4
2018/09/19 13,000 2,300 <0.4
2018/08/22 450 100 <0.4
2018/07/18 320 220 <0.4
2018/06/18 17,000 5,000 <0.4 Significant rain over 2 weeks prior to sample. Raining on day sample taken
2018/02/11 1,700 2,200 Heavy Rain (37mm) 8-12 Feb 2018
2018/02/02 2,300 530 Rain (14 mm) 2 Jan 2018
2018/01/26 650 840 Light rain (14mm) 18 Jan 2018
2018/01/17 40 11 No rain in previous week
2018/01/10 600 410 Heavy Rain (40mm) 4 Jan 2018
2017/12/22 23 46

All levels are reported as cfu/100 ml

To set these results in perspective, the Ministry of Environment provides guidelines for Recreational Fresh Water. These guidelines state that the maximum levels for E Coli   is 550 cfu/100ml and Entrococci is 280 cfu/100ml. As you can see, the water quality in the Wigmore frequently exceeds the maximum level. High levels normally occur during and after rainfall when stormwater washes organic material into the stream.

Our recommendation is to avoid swimming in the Wigmore Stream, particularly when it is raining and for a day or so afterwards

For detailed information on guidelines for recreational water quality in Seawater and Fresh Water, see NZ Ministry of Environment Guidelines here. Microbiological Quality Jun03. Go to table E2 in this publication.

Here is a summary of the recommendations.

Lab Test Results can be viewed by clicking here.

Waikato Regional Council Coastal Recreational Water Quality Monitoring Programme.

Waikato Regional Council (WRC) monitors beaches in the Coromandel. Click here to see the latest information. 

When reviewing WRC data however, note that only seawater from beaches is sampled. We think it is important to also monitor streams that flow into the ocean as many children like to play in the stream estuaries.