The State of Hawai`i Department of Health (DOH), Clean Water Branch (CWB) data portal provides access to water quality data collected since December of 2004. Data collected prior to that are available from the United States Environmental Protection Agency STORET Data Warehouse. Listed below are the specific date ranges for the various data used in this study. Notice the multi-year gap in data from 1998 to 2004. Presumably, no data exists for this time period or it would have been available from either or both government data portals.
If you would like more information about the sites used for collecting water quality samples, visit the sample sites page. Look up the site of interest using the Station Number or Site Name. Not all sites are listed or have additional data, but those that do often have written descriptions, hand-drawn maps, and photos of the collection locations.
The data can be viewed on the CWB data access web portal.
Turbidity and Microbial data downloaded from CWB Water Quality Data Microbiology download page.
| 12/27/2004 | 2/10/2016 | 11702 rows of data |
TN, TP, NO3+NO2, NH4, Chlorophyll a data downloaded from CWB Water Quality Data Chemistry download page.
| 8/14/2006 | 2/10/2016 | 820 rows of data |
The United States Environmental Protection Agency STORET Data Warehouse
| 1/8/1973 | 12/15/1998 | 7234 rows of data |
Name Changes in the dataset (685, 713, and 724 had spelling corrected).
| From | To | ||
| 651 | Hale Onoloa Condominium Shore | 651 | Hale Onoloa Condo Shore |
| 655 | Kaa Shoreline, Paia | 655 | Ka`a Shoreline, Pa`ia |
| 659 | Maalaea Small Boat Harbor | 659 | Ma`alaea Harbor |
| 660 | Mahinahina Condominium Shoreline | 660 | Mahinahina Condo |
| 664 | Paia Outfall, Shoreline | 664 | Pa`ia Outfall, Shoreline |
| 666 | Sheraton Kaanapali Shoreline | 666 | Sheraton Ka`anapali |
| 668 | Waihee Farm Shoreline | 668 | Waihe`e Farm Shoreline |
| 675 | Waiopai | 675 | Wai`opai |
| 681 | Kamaole Beach #1 | 681 | Kama`ole Beach #1 |
| 682 | Kamaole Beach #2 | 682 | Kama`ole Beach #2 |
| 683 | Kamaole Beach #3 | 683 | Kama`ole Beach #3 |
| 685 | Keawekapu Beach | 685 | Keawakapu Beach |
| 687 | Maalaea Condos | 687 | Ma`alaea Condos |
| 688 | Hookipa Beach Park | 688 | Ho`okipa Beach Park |
| 692 | Kaopala Bay | 692 | Ka`opala Bay |
| 693 | Hanakaoo | 693 | Hanaka`o`o |
| 696 | Puunoa (Baby) Beach | 696 | Pu`unoa (Baby) Beach |
| 699 | Kuau (Beach Access 402) | 699 | Ku`au (Beach Access 402) |
| 702 | Mai Ponia Oe Iau (Windsurfer) | 702 | Mai Poina ‘Oe Ia’u |
| 713 | Waipulani | 713 | Waipu`ilani |
| 716 | Poolenalena | 716 | Po`olenalena |
| 719 | Oneuli | 719 | One`uli |
| 720 | Puu Olai (Small Beach) | 720 | Pu`u Ola`i (Small Beach) |
| 721 | Mokuleia | 721 | Mokule`ia |
| 724 | Pohaku | 724 | Pohaki Park |
| 729 | Waianapanapa | 729 | Wai`anapanapa |
| 733 | Kahekili/Airport 2 | 733 | Kahekili / Airport 2 |
There were some obviously erroneous latitude and longitude coordinates, which we corrected. Note that the actual collection point may be many meters away along the beach or shoreline from where the marker displays. Other coordinates in the original data may also be suspect, indicating a shoreline parking place for example, so please contact the Clean Water Branch if greater accuracy is required. Their Sample Sites web portal has photos and hand-drawn maps of most collection sites.
| Original bad latitude, longitude coordinates. | |||
| 706 | Harbor Lights | 20.87778 | -156.476 |
| 655 | Ka`a Shoreline, Pa`ia | 20.89114 | -156.471 |
| 729 | Wai`anapanapa | 20.75583 | -156.004 |
| 665 | Seven Pools, Hana | 20.75469 | -155.969 |
| Corrected coordinates found by looking at Google Maps satellite imagery. | |||
| 706 | Harbor Lights | 20.87778 | -156.476 |
| 655 | Ka`a Shoreline, Pa`ia | 20.89897 | -156.447 |
| 729 | Wai`anapanapa | 20.78859 | -156.004 |
| 665 | Seven Pools, Hana | 20.66233 | -156.041 |