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      Clean ocean water is essential for healthy coral reefs. It’s also important to visitors and residents who enjoy swimming, snorkeling, diving, paddling, fishing and surfing along Maui’s coasts.

      Maui Nui Marine Resource Council is proud to be a major partner in an innovative community-based water quality monitoring program called Hui O Ka Wai Ola (Association of Living Waters).

      We are monitoring water quality during COVID-19
      Our  Hui O Ka Wai Ola program is monitoring all 33 of our leeward Maui sample sites every three weeks. We had taken a brief break from mid-March to May due to safety concerns during the COVID-19 pandemic. Once we received permission from Maui County officials  to continue this essential work, we were able to resume our monitoring schedule.

      Filling an important need

      Download our 2016 – 2018 Coastal Water Quality Report

      The Hui O Ka Wai Ola program is a living breathing example of how nonprofit organizations can effectively work with government agencies to stretch the agencyʻs resources and capabilities.

      Maui Nui Marine Resource Council, The Nature Conservancy and West Maui Ridge to Reef Initiative co-founded and co-manage the Hui O Ka Wai Ola program to support the State of Hawaiʻi Department of Health Clean Water Branch.

      Together with the help of more than 40 volunteers from the community, Hui O Ka Wai Ola has greatly expanded the Department of Healthʻs ability to test ocean water quality at Maui beaches and to provide quality-assured data to County, State and Federal agencies.

      We add to the data collected by the Department of Health with our testing that keeps a close eye on changing water quality conditions that can harm our coral reefs.

      Our community-based program regularly gathers data about sediment, nutrients in the water, temperature, pH and more along Mauiʻs south and west shores. In 2018, our program expanded to include 41 locations. In 2019, we expanded our program to include testing for enterococcus bacteria at our South Maui testing sites.

      As of August 2020,  our Hui O Ka Wai Ola  program has gone from monitoring 41 to 33 sites. After looking closely at the data our volunteers have gathered since June 2016, our Hui O Ka Wai Ola Technical Committee recommended eight sites to “pause” and one site to discontinue for one or more of the following reasons: we have a good understanding of their water quality dynamics, these sites have little to no pollution or fluctuation, no management is currently underway for contributing land based pollution, and/or no permanent funding is available to continue monitoring these sites.

      The Technical Committee also added one site, Kahekili Two, which is north of the previously monitored Kahekili Beach Park site and is closer to the influence of the Lahaina Wastewater Treatment facility.

      Part of this shift to monitor fewer sites allows our program to expand into some other water quality research, such as source detection, including limu nitrogen isotope testing, and working with partners to delve deeper into some of the pollution “hot spots” our data has helped identify. More on this to come!

      We believe this data will allow for more effective management of our nearshore waters and ultimately, healthier coral reefs and cleaner ocean water for all to enjoy.

      Sites currently paused:
      Olowalu Point
      Ukumehame Park
      Sugar Beach
      Mai Poina Park
      Palauea Beach
      Po’olenalena Park (Chang’s)
      Mākena Landing
      One’uli Beach

      Sites recently discontinued:
      Pāpalaua Park

      Sites recently added:
      Kahekili Two

      Sites tested every 3 weeks:

      ​WEST MAUI:
      Honolua Bay
      Napili Bay
      505 Front St.
      Oneloa Beach
      Pōhaku Park
      Kauaula Rd. (Lindsey Hale)
      Kapalua Bay
      Kā’anapali Shores
      Lāhaina Town
      Ka’opala Bay
      Kahekili Two
      Olowalu Shorefront
      Kahana Village
      Hanaka’ō’ō Park (Canoe Beach)
      Camp Olowalu
      Wahikuli Park
      ​Pāpalaua Pali

      SOUTH MAUI
      Mā’alaea Harbor
      Kalepolepo Park
      Kilohana Dr.
      Mā’alaea Condos
      Waipuilani Park
      Keawakapu Beach
      Haycraft Park
      Kīhei South (W. Lipoa St.)
      ʻUlua Park
      Keālia Pond
      Kalama Park
      Maluaka Beach
      Kīhei Canoe Club
      Cove Park
      ‘Āhihi-Kīna’u North
      ‘Āhihi-Kīna’u South

       

      Read our latest Research Report: 
Changes in Water Quality During a 12 Hour Period at Two Maui Beaches

      Interested in volunteering? Learn more

      View comparisons of our results by site:
      South Maui
      West Maui

      Note: the red dotted lines indicate standards set by Hawaii’s Department of Health Clean Water Division.

      What We Test For

      Turbidity

      How it is measured: We gather samples at knee depth, then use a turbidity meter onsite to measure the amount of sediment (turbidity) in the water.

      How changes are caused: Sediment carried from the land to the ocean (by streams, flooding, storm runoff) can cause ocean water to become brown or murky.

      Why it is a concern: Sediment blocks sunlight from reaching reefs and can smother corals.

      What we can do: When we find areas with high levels of turbidity, we can address upslope issues such as grading or clearing of land that caused sediment to flow into the ocean.

      Ocean chemistry

      How it is measured: We measure pH, salinity and water temperature onsite using portable, handheld equipment.

      How changes are caused: Changes in ocean chemistry can be caused by climate change and other local factors. Salinity can be changed by freshwater flowing into the ocean. Water temperature can fluctuate by season and can also be caused by climate change. Ocean acidity can be increased warming ocean temperatures. Warmer water also holds less dissolved oxygen (needed for aquatic plants and animals to survive).

      Why it is a concern: Corals are very sensitive to changes in ocean chemistry, including increased ocean water acidity. Corals bleach when water temperature increases; collecting water temperature can help track localized variations between sites.

      What we can do: We can monitor changes in reef health against changes in ocean water quality and continue to advocate for ways to reduce greenhouse gases and reverse climate change.

      Nutrients (nitrogen and phosphorous)

      How they are measured: Water samples are gathered, refrigerated and shipped on ice to the SOEST Analytical Laboratory on Oahu for analysis of nitrogen and phosphorous.

      How changes are caused: High levels of nitrogen and phosphorous can indicate pollution from wastewater, run-off from agriculture, landscaping and/or golf courses.

      Why itʻs a concern: Too much nitrogen can cause an increase in invasive algae (limu), which is damaging to coral reefs.

      What we can do: When we identify ocean areas with high levels of nutrients, we can pinpoint and address up-slope areas that are sources.

      Bacteria

      How it is measured: Water samples are gathered in sterile bags, which are then sealed and refrigerated. Samples are shipped on ice to regional labs, where they are analyzed for Enterococcus bacteria.

      How it is caused: Bacteria may result from wastewater pollution. Enterococcus bacteria also live in soil and can be carried into the ocean via runoff.

      Why itʻs a concern: Enterococcus bacteria are generally not harmful by themselves but do indicate the possible presence of pathogenic (disease-causing) bacteria, viruses, and protozoans that also live in human and animal digestive systems.

      View our results

      Where We Test

      WEST MAUI

      Honolua Bay
      Napili Bay
      505 Front St.
      Oneloa Beach
      Pōhaku Park
      Kauaula Rd. (Lindsey Hale)
      Kapalua Bay
      Kā’anapali Shores
      Lāhaina Town
      Ka’opala Bay
      Kahekili Two
      Olowalu Shorefront
      Kahana Village
      Hanaka’ō’ō Park (Canoe Beach)
      Camp Olowalu
      Wahikuli Park
      ​Pāpalaua Pali

      SOUTH MAUI

      Ma’alaea Harbor
      Kalepolepo Park
      Kilohana Dr.
      Ma’alaea Condos
      Waipuilani Park
      Keawakapu Beach
      Haycraft Park
      Kīhei South (W. Lipoa St.)
      Ulua Park
      Keālia Pond
      Kalama Park
      Maluaka Beach
      Kīhei Canoe Club
      Cove Park
      ‘Āhihi-Kīna’u North
      Ahihi Kina’u South

      Our partners

      Hui O Ka Wai Ola works closely with the State of Hawaii Department of Health (DOH). The program is managed by these nonprofit partners:

      • Maui Nui Marine Resource Council (MNMRC)
      • The Nature Conservancy (TNC)
      • West Maui Ridge to Reef (R2R) Initiative

      Gallery

      Reef in Brief
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