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  • Why this status?

    Click here for detailed information on water quality monitoring

    The science

    Water quality information

    LAWA shows the best available water quality information to help you to decide where to swim.  The water quality of swimming sites in the Northland region is determined by predictive models and water quality monitoring.

    Predicted risk status

    Current E. coli statusPredicted water quality
    10:15 pm today

    The predicted result is checked every 15 minutes so you can see the current water quality status for this site.

    Reminder

    Heavy rain flushes contaminants from urban and rural land into waterways and we advise you not to swim for 2 – 3 days after heavy or prolonged rain – even at sites that generally have good water quality. Check that the water is clean and clear before taking a dip.

    Toxic algae can rapidly bloom to harmful levels, and not all freshwater sites are monitored for toxic algae. Play it safe — if you can see toxic algal blooms in rivers or lakes, avoid contact or choose another site to swim.

    What do the icons mean?

    Suitable for swimming – The current prediction is that the water quality meets national guideines for swimming and there is a low risk of illness. The monitored water quality result met national guidelines at the time of testing.
    Caution advised – The monitored water quality test result is slightly elevated. Water quality at the time of testing was generally suitable for swimming, but young children, elderly or those with compromised health may be at increased risk of illness.
    Unsuitable for swimming – The current prediction is that the water quality does not meet national guidelines for swimming and there is a high risk of illness. The monitored water quality result did not meet national guidelines at the time of testing.
    Not available – Data temporarily unavailable.

    Summer season monitoring history

    The water quality monitoring results are shown in the graph below.  Here you can see how often this site met swimming water quality guidelines at the time of sampling.  The latest monitoring result shown may differ from the predicted risk status displayed, this is because the predicted risk status takes into account other factors such as the amount of rain forecast to provide the current risk status.

    • Samples this season
    • Samples from last 5 years
    E. coli sampling graph
    • View as graph
    • View as donut

    Long-term grade information

    Long-term grade based on five years of data
    Minimum data points required 50 Highest E. coli per 100ml value {{riskData.maxValue | number:0}}
    Number of data points available {{riskData.dataPoints | number:0}} Lowest E. coli per 100ml value {{riskData.minValue | number:0}}
    Hazen 95th percentile result {{riskData.hazenResult}} Long-term grade
    {{riskData.rating}}

    What do the long-term grade icons mean?

    Excellent – The estimated risk of Campylobacter infection has a <0.1% occurrence, 95% of the time.
    95th percentile of E. coli / 100 mL is <= 130.
    Good – The estimated risk of Campylobacter infection has a 0.1 - 1% occurrence, 95% of the time.
    95th percentile of E. coli / 100 mL is > 130 and <= 260.
    Fair – The estimated risk of Campylobacter infection has a 1 - 5% occurrence, 95% of the time.
    95th percentile of E. coli / 100 mL is > 260 and <= 540.
    National bottom line: 95th percentile: 540
    Poor – The estimated risk of Campylobacter infection has a >5% occurrence, at least 5% of the time.
    95th percentile of E. coli / 100 mL is > 540.
    Not available – There were not enough data to determine the long-term grade at this site.

    Learn more

    See factsheets for more information.

     Download data

  • What about my dog?

    Information about toxic algae

    Dog owners

    Keeping your dog safe and healthy this summer

    A trip to a lake is a lot of fun and knowing how to keep your dog safe means you are able to relax and enjoy the adventure even more.  Toxic algae can be harmful to dogs (and us) – this section shows you what to look for.

     Planktonic bloom

     

    What to do

    • The best thing you can do to keep yourself, your kids and your dog safe is to know what toxic algae looks like and avoid it. 

    • If you are not sure, keep your dog on a lead at a lake and don’t let them in or near the water.  Bring water from home for your dog so that they don’t need to drink out of the lake.

    What is toxic algae?

    Toxic algae, known scientifically as cyanobacteria, are naturally occurring in rivers and lakes in New Zealand, including waterways with good water quality.  Most of the year it is present in lakes at low levels that are not much of a danger.  But algae can be a problem during the summer months, when warm temperatures and nutrients in the lake create an environment where it can thrive, forming extensive blooms which can be toxic to humans, dogs, livestock and wildlife. 

    Scientists do not yet understand when and why this algae turns toxic, so to be safe, always treat it as toxic.

    Dogs are particularly susceptible to poisoning from toxic algae as they may drink lake water or play in the water. 

    What to look for

    Toxic algae grows within the water column in lakes and cause the water to become murky or cloudy. 

    These free floating algae blooms in lakes are generally green in colour and can look like paint, petrol or pea soup. It can also form foam or scum on the water’s surface, especially at the water’s edge.  Sometimes blooms may not be very visible.

    Council staff monitor for these mats in lakes where blooms are known to occur.  Blooms can occur very suddenly (within an hour) so please alert your regional or unitary council if you notice a new algal bloom in a lake.

    What if my dog has eaten toxic algae?

    If you suspect that your dog has eaten toxic algae, you should contact your vet as soon as possible.  Signs a dog has been poisoned by toxic algae include lethargy, muscle tremors, fast breathing, twitching, paralysis and convulsions.

    Find out more about toxic algae here

  • What's at this site?

    Find out all recreational activities and facilities at this site

    Activities & facilities

    Site suitable for these activities and has these facilities

    Our lakes, rivers, and beaches are great natural playgrounds but they can be unpredictable.  Be aware of other potential risks such as rips, strong currents, sudden drop offs, or underwater objects before jumping in.  LAWA recommends that you avoid swimming for 2 - 3 days after heavy rainfall and follow the advice of any warning signs in place.

    Activities

    Swimming
    Canoeing/Kayaking

    Facilities

    Toilets
    Car parking

How do I get there?

Lake Rotopokaka (Coca-Cola)
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