Gangneung Water Crisis Deepens as Obong Reservoir Falls to 12.6 Percent

A reservoir running low, a city conserving every drop

Gangneung, a coastal city of about 200,000 people on South Korea's east coast, is facing its worst drought in 108 years of weather records. By September 7, 2025, Obong Reservoir, which supplies roughly 87 percent of the city's tap water, had fallen to about 12.6 percent of capacity. President Lee Jae Myung designated the area a national disaster zone in late August as extreme heat and months of scarce rain pushed its main water source toward empty.

Officials have reduced water pressure across neighborhoods and shut off 75 percent of household meters to conserve supplies. Public bathrooms and all municipally run sports facilities are closed. A football match in the third tier will take place without spectators, while several other events have been canceled or postponed so water can be directed to essential uses.

Obong fell below the 15 percent storage threshold considered necessary to provide safe drinking water by the end of August. City figures put storage at 14.9 percent on the Sunday morning after the disaster declaration. Its subsequent fall to around 12.6 percent has brought Gangneung closer to a further restriction: if storage drops below 10 percent, the city plans to stop supplying water overnight.

Fire tankers, military and forestry helicopters, Coast Guard and Navy vessels, and temporary pipelines are now helping sustain supplies. Residents are collecting bottled water, large apartment complexes are preparing for deliveries, and authorities are trying to slow the reservoir's decline while forecasts offer little immediate relief.

Record heat meets months of missing rain

Gangneung received about 38.77 centimeters of rain over the past six months, according to city data. That is 45.3 percent of the average for the period, leaving the city with less than half its usual rainfall. Korea Meteorological Administration figures put cumulative rainfall through late August at about 404 millimeters, around 40 percent of normal for that period.

The two measurements cover different periods, but both describe a severe shortage of rain. At the same time, South Korea experienced its hottest June to August period since national records began in 1973, exceeding the previous record set in 2024. The heat dried soils, increased evaporation and drove up demand for air conditioning.

Meteorologists describe Gangneung's experience as a flash drought. This is a rapid drying process in which persistent heat, low humidity and wind speed up moisture loss from soil and water surfaces. Unlike a drought that builds gradually over months or years, a flash drought can quickly place water supplies under pressure as demand rises and stored water disappears.

Forecasts issued at the start of September offered little help. They called for less than 5 millimeters of rain on one day and little or no additional rainfall until at least September 10. With so little replenishment expected, the city has had to rely on conservation and emergency deliveries.

How Gangneung reached this point

Obong's decline has forced officials to make successive choices about who receives water and when. Agricultural supplies were halted to prioritize drinking water. Restrictions then spread through the municipal network, including the shutdown of three quarters of household meters to preserve a minimal level of pressure for remaining users and critical services.

The main developments span several dates:

• Summer 2024: Obong Reservoir fell below 30 percent of capacity, prompting conservation measures.
• Late August 2025: President Lee Jae Myung designated Gangneung a national disaster zone as reservoir storage reached critical levels.
• By the end of August: Obong fell below the 15 percent operating threshold. Storage stood at 14.9 percent on the Sunday morning after the declaration.
• September 5: Mayor Kim Hong kyu said water from the Hongje purification plant would be cut to 123 sites with large storage tanks.
• September 7: Reservoir storage was reported at about 12.6 percent.
• Through at least September 10: Early September forecasts indicated little prospect of substantial rainfall.

The city projects that Obong could fall into single digits in the coming weeks without meaningful rain. Provincial authorities have warned that storage could approach 9.7 percent if substantial rainfall fails to arrive.

What the disaster declaration sets in motion

The national disaster designation allows the central government to send additional aid, personnel and equipment. After the presidential order took effect, Gangwon Province raised its emergency posture to Level 2 under the Central Disaster and Safety Countermeasures Headquarters system, triggering a full mobilization.

The provincial vice governor leads the emergency headquarters. A support group bringing together officials from key ministries, Gangwon Province and Gangneung's city government is coordinating water deliveries and public communication. The response links decisions about reservoir supplies with practical tasks such as dispatching vehicles and informing residents about restrictions.

Provincial officials say 71 fire department tankers have been deployed, including dozens mobilized by the National Fire Agency. Tanker operations are intended to move about 2,500 metric tons of water each day. The military and fire agencies have become part of the city's daily supply system as its usual source weakens.

The emergency measures also require choices about limited water. Drinking supplies and critical services take priority, while agricultural deliveries, recreation and some public facilities have been curtailed. The restrictions extend from the reservoir and purification plants to individual household connections.

Water arrives by helicopter, ship and temporary pipe

The Korea Forest Service and the Defense Ministry have sent aircraft to ferry water. The helicopters include two S 64 aircraft, each able to carry about 8,000 liters, and two Kamov helicopters with capacity of roughly 3,000 liters each. Forestry and military crews are making shuttle runs as part of the effort to keep water moving into the system.

The Coast Guard and Navy are assisting at sea. The Coast Guard patrol ship Sam Bong, a vessel of 5,000 tons, delivered about 600 tons of water to Anin port. That shipment was enough to refill around 50 fire trucks. More vessels are scheduled to rotate through, supplying tankers that can carry the water onward.

Nearby rivers and plants are also contributing. On one day in early September, teams directed about 26,416 tons of water into the reservoir and purification plants through truck deliveries and temporary pipes connected to the Namdaecheon River. Government briefings put combined deliveries from helicopters, ships, pipelines and trucks at close to 30,000 tons on some other days.

The city plans to maintain that pace until rain returns or reservoir storage stabilizes. Helicopters, ships and hundreds of vehicles now form a daily water transport operation intended to slow Obong's decline and keep treatment plants operating. Deliveries also go directly to neighborhoods and storage tanks at large facilities.

Apartment tanks and overnight cuts

Mayor Kim Hong kyu said on September 5 that the city would cut water from the Hongje purification plant to 123 sites with large tanks. Those sites include 113 apartment complexes and 10 large hotels. City officials estimated that their stored water would last two or three days, after which deliveries by truck would begin.

Those tanks provide a short reserve for buildings that house many residents or visitors. Apartment managers and hotels are coordinating with the city on rationing schedules and truck deliveries as the municipal supply tightens. Businesses with storage tanks have also begun planning for deliveries.

If Obong falls below 10 percent, the city's plan calls for stopping the water supply from 10 p.m. to 5 a.m. If conditions worsen further, supply would move to alternate days. No date has been given for reaching those stages; the next steps depend on reservoir storage and whether meaningful rain arrives.

The mayor has repeatedly urged residents to reduce consumption, saying voluntary savings are part of keeping the system operating until the weather changes or more water can be brought in at scale. Gangneung Mayor Kim Hong kyu said:

We can survive this drought only if we all conserve and use water sparingly.

Daily routines, tourism and farming are disrupted

Residents have queued at drive through distribution points for bottled water, while city workers deliver supplies to large apartment complexes. Households are limiting laundry, dishwashing and bathing. Some are collecting rinse water in small containers to use again for cleaning or watering plants.

Public bathroom closures have reduced access to everyday facilities. Municipal swimming pools, tennis courts and a golf club are among the sports facilities shut to save water. The decision to hold a third tier football match without spectators, alongside event cancellations and postponements, extends the emergency into the city's sporting and public calendar.

Gangneung is a popular seaside destination, and visitor numbers rose sharply this summer despite the dry conditions. Local authorities say the influx adds pressure to limited supplies. Hotels are briefing guests on conservation, while tourism officials and city managers consider ways to manage visitor water use while supporting the local economy and protecting essential supplies for residents.

Some restaurants have reduced menu items that require large amounts of water and posted signs asking customers to conserve. Farmers have tightened irrigation or paused harvesting of crops that need substantial water in areas where agricultural supplies have been suspended.

The city is asking residents to report leaks immediately and avoid lawn watering, car washing and filling private pools. Schools and public offices have posted conservation guidance for students and staff. Faith groups are arranging bottled water donations for elderly residents and people with limited mobility.

Community aid reaches affected neighborhoods

A Catholic medical charity has delivered 10 tons of bottled water to parishes for distribution in neighborhoods hit hard by the drought. The shipment adds a community distribution route to the government operation, with parishes helping get drinking water to residents.

Min Chang ki, director of the Catholic Medical Center, said the organization would continue monitoring needs and providing assistance as conditions change. Describing the shipment, he said:

Though it is a small effort, we hope it helps the citizens of Gangneung and that this severe drought is resolved as soon as possible.

Community deliveries operate alongside the city's distribution to apartment complexes and public collection points. For residents with limited mobility, organized deliveries are especially relevant as queues and reduced tap supplies complicate access to water.

Mountains and sudden downpours shape the shortage

Gangneung lies east of the Taebaek Mountains, which separate the coastal city from central and western parts of the Korean Peninsula. The mountain barrier can reduce consistent rainfall and produce sharp seasonal differences in the amount of water reaching the area.

Much of the region's annual precipitation arrives during typhoons in short, intense bursts. Water from those downpours can rush quickly to the sea instead of replenishing upstream reservoirs. Heat after the rain then removes more moisture, leaving less water available for storage.

This summer, record heat and the lack of sustained rain combined with that geography to push Obong toward empty. Gangneung's heavy dependence on a single reservoir makes a drop there particularly difficult to absorb. Obong also lacks the storage capacity of larger multipurpose dams, limiting the reserve available when dry weather persists.

Repeated shortages and a stalled backup plan

Gangneung has experienced droughts and supply disruptions since the 1990s. A typhoon contaminated supplies in 2002, cutting tap water for days. Severe drought depleted reservoirs in 2009. Water levels plunged again in 2014 before sudden downpours brought temporary relief. Obong's fall below 30 percent in summer 2024 prompted another round of conservation.

For years, local and central authorities have discussed releasing water from Doam Dam in neighboring Pyeongchang to supplement Gangneung's supply. Civic and environmental groups opposed the proposal because of concerns about water quality and ecological risks. Agencies also disagreed over responsibility and acceptable standards.

The plan stalled, leaving Gangneung dependent on Obong and a handful of smaller sources, with few alternatives when the main reservoir runs low. The current emergency brings that longstanding weakness into daily life: water must now be transported by road, air and sea while residents reduce consumption.

Policy analysts see the crisis as part of wider gaps in climate readiness across infrastructure. South Korea has faced deadly wildfires, destructive floods and typhoon damage in recent years. Systems designed around past weather conditions are being placed under pressure as extreme conditions become more frequent.

Immediate relief and longer term repairs

Planners and specialists have identified several ways to reduce Gangneung's dependence on emergency rescues. Proposals include connecting more water sources to the city network, strengthening transfer pipelines between cities, expanding leak detection and pressure management, and increasing reuse for industry and outdoor activities.

Reusing water for those purposes would leave more drinking water available for household taps. Several engineers also advocate collecting rainwater from large roofs at schools and gyms, then storing it for uses such as toilet flushing and irrigation. Such water is described as nonpotable, meaning it is intended for purposes other than drinking.

New sources, better storage and more efficient use are being debated as ways to give the system backup capacity. For now, the immediate task remains maintaining supplies through deliveries and conservation while watching Obong's storage level and the weather.

Shortages are also emerging elsewhere in Gangwon Province. Samcheok, Jeongseon gun and Taebaek have reported water supply concerns, and some communities have begun preparing their own emergency measures. Gangneung's operation gives it some breathing room, but early September forecasts offered only traces of rain through September 10 and uncertainty afterward.

As of September 7, the next practical thresholds are clear: substantial rain could help replenish supplies, while a fall below 10 percent at Obong would trigger planned overnight cuts. Authorities are continuing deliveries and asking residents, businesses and visitors to save water as they prepare for either outcome.

What to Know

• Gangneung, with about 200,000 residents, is facing its worst drought in 108 years of weather records.
• President Lee Jae Myung designated the area a national disaster zone in late August 2025.
• Obong Reservoir supplies roughly 87 percent of the city's tap water. Storage fell from 14.9 percent after the declaration to about 12.6 percent by September 7.
• Officials shut off 75 percent of household meters. Planned cuts at 123 large sites cover 113 apartment complexes and 10 hotels.
• The response includes 71 fire tankers, forestry and military helicopters, Coast Guard and Navy vessels, and temporary pipelines.
• Emergency supplies reached about 26,416 tons on one day and approached 30,000 tons on some others.
• Public bathrooms and municipal sports facilities are closed, agricultural water has been halted, and events have been restricted.
• Six months of rainfall totaled about 38.77 centimeters, or 45.3 percent of average, during South Korea's hottest summer since records began in 1973.
• If reservoir storage falls below 10 percent, planned cuts would run from 10 p.m. to 5 a.m., followed by alternate day supply if conditions worsen.
• Proposals for greater resilience include additional sources, connections between cities, leak reduction, water reuse and rainwater collection.