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48% of resident wastewater from the Lahaina Municipal Wastewater Reclamation Facility flows into nearshore injection wells.
On average, about 48% of resident wastewater is discharged into nearshore injection wells at the Lahaina Wastewater Reclamation Facility, while about 52% is used in irrigation disposal. Detailed UIC water quality and County of Maui flow reports here.
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Lahaina WWRF injected Total Nitrogen & Total Phosphorus from 1999 - 2021
Injected nutrient concentrations in Lahaina from 1999-2021 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 UIC water quality and County of Maui flow reports here.
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Lahaina WWRF total Plant Flow, Injection Well Flow and Reuse Flow (MGD)
Flow data in Lahaina from 1999-2021 show a steady decline in total plant flow and injection flowrates, and steady increase in reuse, down to about 3.5 MGD total plant flow & 2 MGD injection, and up to 1.5 MGD reuse. Detailed UIC water quality and County of Maui flow reports here.
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Lahaina WWRF Total Plant injected and Reuse Nutrient Total Nitrogen + Total Phosphorus Mass Loading (lbs/year)
From 1999-2021 total mass of dissolved nutrients discharged total and to injection have decreased steadily, while reuse nutrient mass has increased slowly. Detailed UIC water quality and County of Maui flow reports here.
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Lahaina WWRF injected Coliform (MPN/100mL) 1999 - 2021
An analysis of fecal coliform cell counts from 1999-2021 shows that injected municipal wastewater was not disinfected in Lahaina until about 2012, and has been almost free of fecal coliform since then. Detailed UIC water quality and County of Maui flow reports here.
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Lahaina Wastewater Reclamation Facility By The Numbers
Lahaina Wastewater Reclamation Facility Flow and Nutrient Summary
April 2020 total flow (MGD) Ave. 2020 reuse flow (MGD) Est. April 2020 injection flow (MGD) 2020 injected TN (mg/L) 2020 injected TP (mg/L) 2.4 1.2 1.1 5.21 1.92 The average daily plant flow at the Lahaina Wastewater Reclamation Facility in April 2020 was about 2.4 MGD, average reuse in 2020 was about 1.2 MGD, so estimated injection was about 1.1 MGD. Total Nitrogen in the same period was over 5.2 mg/L and Total Phosphorous was about 1.9 mg/L. Detailed UIC water quality and County of Maui plant flow reports here.
Lahaina Wastewater Reclamation Facility Nutrient Per Census Resident
Inj. nutrients / census resident / year (lbs/year) Inj. wastewater / census resident / year (gallons/year) Inj. wastewater / census resdient / day (gallons/day) 1.2 20,696 57
The total estimated nutrient mass injected per census resident per year at the Lahaina Wastewater Reclamation Facility is about 1.2 pounds of dissolved nutrients per year. Each resident contributes about 21K gallons to injection per year in Kihei, averaging about 57 gallons per resident per day. Detailed UIC water quality and County of Maui plant flow reports here.
Lahaina Wastewater Reclamation Facility Fecal Coliform Per Census Resident
Injected coliform cell counts (MPN/100mL) Total inj. coliform cell counts / resident (MPN/year) <1.0 <783,420
Injected fecal coliform Most Probable Number of colony forming (infection forming) units injected at the Lahaina WWRF was recently measured at less than 1.0 per 100 mL, which is below the detection limits for the test used. Total injected fecal coliform colony forming units per census resident is below 784K cells per year. Detailed UIC water quality and County of Maui plant flow reports here. -
Lahaina Municipal Wastewater Reclamation Facility Compliance Reporting History
Date total flow (MGD) reuse flow (MGD) injection flow (MGD) Total Nitrogen (mg/L) Total Phosphorus (mg/L) coliform (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 8/15/06 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 7/17/09 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 4.387 1.480 2.907 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 3.894 1.058 2.836 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 4.366 1.835 2.531 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 4.040
0.944
3.096
6.85 0.352 < 1 6/28/22 4.386
1.822
2.564
5.631 1.90 < 1 12/07/22 - - - 3.21 1.25 1