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Percentages of resident wastewater from the Lahaina Municipal Wastewater Reclamation Facility flowing into irrigation reuse and nearshore injection wells.
This chart shows the percentage of resident wastewater that is discharged into nearshore injection wells from the Lahaina Wastewater Reclamation Facility, and the percentage that is reused in irrigation disposal, with recent data showing Reuse 40.3% and Injection 59.7%. Detailed County of Maui plant flow reports.
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Lahaina WWRF injected Total Nitrogen & Total Phosphorus from 1999 - 2025
Injected nutrient concentrations in Lahaina from 1999-2025 showed a stable trend of about 6 mg/L Total Nitrogen and a slight downward trend in Total Phosphorus ending up around 1 mg/L. Detailed County of Maui plant flow reports.
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Lahaina WWRF total Plant Flow, Injection Well Flow and Reuse Flow (MGD)
Flow data at the Lahaina WWRF from 1999 - 2026 shows total plant flow, reuse and injection flowrates. Detailed County of Maui plant flow reports.
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Lahaina WWRF Total Plant injected and Reuse Nutrient Total Nitrogen + Total Phosphorus Mass Loading (lbs/year)
From 1999 - 2026 total mass of nutrients discharged total and to injection are shown here. Detailed County of Maui plant flow reports.
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Lahaina WWRF injected Coliform (MPN/100mL) 1999 - 2025
An analysis of fecal coliform cell counts from 1999-2025 shows that injected municipal wastewater was not disinfected in Lahaina until about 2012, and has been almost completely free of fecal coliform pathogen indicators since then. Detailed County of Maui plant flow reports.
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Lahaina Municipal Wastewater Reclamation Facility Compliance Reporting History
Total Flow Reuse Flow Injection Flow Total Nitrogen Total Phosphorus coliform Date MGD MGD MGD mg/L mg/L MPN/100mL 1/11/99 6.321 1.006 5.315 6.7 1.3 < 2 8/9/99 5.685 1.536 4.149 6.1 1.7 < 2 1/31/00 5.13 0.825 4.305 6.9 2 500 7/20/00 5.489 1.53 3.959 0.844 1.66 2 2/13/01 5.391 0.542 4.849 7.06 2.31 < 2 7/25/01 5.335 0.842 4.493 9.294 2.78 1600 1/29/02 5.032 0.294 4.738 7.12 2.03 2 7/19/02 5.12 1.171 3.949 5.63 1.37 70 2/4/03 5.01 0.794 4.216 6.8 0.391 240 7/17/03 5.386 1.248 4.138 5.6 0 70 2/6/04 5.378 0.826 4.552 5.92 1.24 17 7/16/04 5.1 1.222 3.878 4.33 0.26 110 2/7/05 5.11 0.837 4.273 2.4 0.45 4 8/9/05 5.275 1.435 3.84 4.29 0.24 500 1/27/06 5.087 1.111 3.976 3.48 0.22 > 1600 8/6/06 4.877 1.942 2.935 1.66 0.83 > 1600 1/22/07 4.532 1.414 3.118 3.75 1.58 900 8/8/07 4.741 1.47 3.271 2.25 0.61 > 1600 2/7/08 4.693 0.932 3.761 7.68 0.35 > 1600 8/4/08 4.526 1.425 3.101 15.37 0.33 240 2/13/09 4.055 0.97 3.085 4.54 0.22 > 1600 7/19/09 4.238 1.477 2.761 2.68 0.7 > 1600 01/15/10 3.991 1.009 2.982 2.783 0.7 540 07/19/10 4.091 1.555 2.536 5.32 0.42 540 01/12/11 4.308 0.682 3.626 3.06 0.3 110 07/25/11 4.008 1.659 2.349 5.56 0.26 540 01/23/12 3.849 1.058 2.791 7.6 0.35 < 1.8 07/10/12 3.985 1.497 2.488 5.24 0.43 2 01/03/13 3.744 1.19 2.554 7.52 1.51 > 1.8 07/15/13 4.519 1.506 3.013 7.89 0.65 < 1.8 01/24/14 3.897 0.236 3.661 3.19 0.74 > 1.8 07/23/14 3.865 1.389 2.476 4.28 0.45 < 1.8 01/12/15 3.943 0.99 2.953 5.41 0.26 > 1.8 07/27/15 3.908 1.592 2.316 7.22 1.1 < 1.8 01/15/16 3.962 1.029 2.933 7.26 0.7 2 06/15/16 4.004 1.762 2.242 4.55 0.34 1 01/26/17 4.014 1.331 2.683 4.69 0.53 1 08/07/17 4.336 1.835 2.501 6.03 0.49 < 1 01/31/18 4.248 1.254 2.994 4.62 0.39 < 1 08/09/18 4.149 1.345 2.804 5.9 0.44 < 1 01/29/19 4.02 1.063 2.957 4.57 0.47 < 1 07/29/19 4.379 1.944 2.435 7.37 1.4 < 1 01/17/20 4.285 0.889 3.396 4.7 0.481 6.3 07/16/20 2.676 1.565 1.111 5.723 3.36 < 1 01/07/21 3.372 1.049 2.323 5.26 0.098 < 1 07/14/21 4.572 1.624 2.948 6.28 0.216 < 1 01/19/22 4.04 0.944 3.096 6.85 0.352 < 1 06/28/22 4.386 1.822 2.564 5.631 1.9 < 1 01/13/23 4.609 1.265 3.344 3.21 1.25 1 06/23/23 4.368 1.672 2.696 6.69 2.1 < 1 01/18/24 3.486 0.825 2.661 5.928 3.7 < 1 07/19/24 3.544 1.668 1.876 5.411 1.6 < 1 07/11/25 3.242 1.491 1.751 4.69 2.15 < 1 12/24/25 3.065 1.048 2.017 7.03 2.52 < 1