Metro Manila (CNN Philippines) — The United Nations (UN) has declared March 22 (Tuesday) as World Water Day, a day dedicated to learning more about water-related issues.

For 2016, the theme of World Water Day is “Water and Jobs,” a campaign coordinated by the International Labor Organization (ILO) on behalf of UN-Water.

According to the UN, millions of people who work in the water sector are often not recognized or even protected by basic labor rights.

This rings true in the Philippines, where fisherfolk and farmers are among the poorest sectors in the country. As per a Philippine Statistical Authority (PSA) report in 2014, fishermen and farmers listed a poverty incidence rate of 39.2 percent and 38.3 percent, respectively.

WATCH: How to conserve water

The UN put a spotlight on fishermen, farmers, factory workers, water carriers, and water utility workers — people whose work would greatly benefit from sufficient and clean water.

“Many of us take it for granted that, when we turn on our taps or faucets, safe water will always be there,” said the UN on its Facebook page.

“But have you ever really considered how much water you use on a daily basis?”

Limited water

Meanwhile, the National Water Resources Board (NWRB) reminded the public to conserve water, especially now that the country is experiencing El Niño.

“Sabi nila, water is unlimited. Hindi na siya unlimited. Marami nang gumagamit and ‘yung quality niya naapektuhan,” said NWRB Executive Director Sevillo David.

[Translation: “They say water is unlimited. It no longer is. Many people use water now and the quality is compromised.”]

He said freshwater supply is affected by waste and pollution, and added that “increasing development, increases demand [for water].”

Today, about 140 billion cubic meters of freshwater is available for consumption. Half of this is used for irrigation, power, and domestic use.

Also read: Officials guarantee enough water supply in Metro Manila, nearby provinces this summer

In Metro Manila alone, water consumption amounts to 4,000 million liters per day.

Ninety-seven percent of this water comes from Angat Dam and the rest comes from river systems, lakes, and groundwater.

Authorities have warned that climate change may deplete water resources in the long run.

“Although we were able to store enough volume in the Angat reservoir, we are still experiencing El Niño,” said Engr. Ronald Padua, head of Maynilad water supply operations.

Watch: El Niño: Facts and Figures

CNN Philippines’ Camille Abadicio contributed to this report.