Question 1

Is it safe to swim at Hanalei Bay?

Accepted Answer

Hanalei Bay has a High bacteria risk rating (4 out of 5). The Hawaii Department of Health has listed the bay as impaired for enterococcus bacteria since 2004. Four streams and rivers discharge into the bay, and over 360 active cesspools exist between Hanalei and Ha'ena. The risk varies dramatically by location within the bay. Near the river mouth (Black Pot Beach/Pier area), bacteria levels are chronically elevated. The outer western parts of the bay are substantially cleaner. Always check for active advisories before swimming.

Question 2

Why is Hanalei Bay polluted?

Accepted Answer

Multiple factors contribute: four streams discharge into the bay (Hanalei River, Wai'oli Stream, Waipa Stream, and Waikoko Stream). The Hanalei River watershed drains from Mount Wai'ale'ale, which receives over 400 inches of rainfall per year, carrying sediment and bacteria. Over 360 cesspools between Hanalei and Ha'ena leach untreated human waste into groundwater. Stanford University and USGS research confirmed human wastewater markers in the bay's waters. The EPA has established a Total Maximum Daily Load (TMDL) for bacteria in the bay.

Question 3

Where is the cleanest place to swim in Hanalei Bay?

Accepted Answer

The western end of the bay, away from the Hanalei River mouth, generally has much better water quality than the eastern end near Black Pot Beach and the pier. Areas like Waikoko and the western sand sections have more ocean flushing and less direct river influence. However, after heavy rain, the entire bay can be affected. If the river is visibly brown or muddy where it enters the bay, bacteria levels are likely elevated throughout.

Question 4

How often does Hanalei Bay fail bacteria tests?

Accepted Answer

Surfrider Kauai's Blue Water Task Force testing found that 'The Bowl' surf break at Hanalei was polluted approximately 20% of the time as of their 2015 data. Hanalei Beach County Park had a 34% bacteria exceedance rate according to 2013 national beach data. The bay has been continuously listed as impaired by DOH since 2004. Conditions are worst during and after rain events on Kauai's North Shore.

Question 5

Where should I swim instead of Hanalei Bay?

Accepted Answer

On Kauai, Poipu Beach on the South Shore (risk 2/5) is a cleaner option with lifeguards and calmer conditions. Salt Pond Beach on the dry west side is consistently clean with no stream mouth. If you're staying on the North Shore, swimming at the western end of Hanalei Bay away from the river, or checking Ke'e Beach at Ha'ena (risk 2/5) are better options. Always verify current conditions before swimming.

Question 6

What are cesspools and why do they matter at Hanalei?

Accepted Answer

Cesspools are simple holes in the ground that collect household wastewater without treating it. Unlike septic systems, they do not filter or break down waste. The untreated sewage seeps into groundwater, which flows into streams and the ocean.

Kauai has approximately 14,000 cesspools island-wide, with over 360 concentrated in the Hanalei to Ha'ena corridor. Hawaii passed Act 125 in 2017 requiring all cesspools to be upgraded by 2050, but progress has been slow. The Hanalei Initiative has been mapping and prioritizing the highest-risk cesspools and working with homeowners to upgrade their systems, but many remain active.

Question 7

Is Princeville Beach the same as Hanalei Bay?

Accepted Answer

Princeville is a resort community on the cliffs above Hanalei Bay. The beach at Hanalei Bay is sometimes called Princeville Beach by visitors staying in the area, though Princeville itself sits on the bluffs above the bay rather than on the beach.