Emergency bottled water deliveries are being set up as around 1,500 customers were affected by a water supply problem on Sunday (July 15).
Southern Water said that a "technical issue" at Vinings Water Treatment Works in West Sussex meant some of its customers were "likely to shortly have interrupted water supplies."
The water company said it had implemented emergency plans in light of the issue.
It tweeted: "While we work hard to fix the issues & restore normal supplies we’re currently setting up manned bottled water stations & we’ll let you know where they’ll be shortly.
"We’re also tankering in extra water to limit the number of customers affected & are organising bottled water deliveries for our customers in vulnerable circumstances in the affected areas.
"We’re really sorry because we know how inconvenient it is to be without water, particularly in this extremely hot weather & thanks for your patience & understanding while we work to restore water supplies to normal."
A Haslemere postcode has once again been affected by the shortage – earlier this month parts of the town had either no water or very low pressure after a power failure at the Blackdown Reservoir .
List of affected postcodes

GARDNER, Kan. — They’re powerful words, yet not everybody says "thank you."
The back porch at the Gardner Police Department is more than a shady spot.
For the past three weeks, it`s been a drop off spot for community kindness.
Steve Benz said officers have found cases of bottled water on the building’s back stoop, donated mostly from anonymous people.
They’d gone out into the field and come back, and there were a couple of flats of water on the back steps," Benz said.
Police officers are known for working long shifts in the heat, often while wearing heavy Kevlar protective vests, some of which can weigh more than 20 pounds.
Pastor Joey Lang, who has led nearby Grace Baptist Church for eight years, is a regular customer and said Gardner citizens love their local officers.
We like to say thank you," Lang said.
They see them in the places we’re drinking coffee," he added.
Ironically, Lang said his Sunday morning sermon will be rooted in gratitude, a message that reflects the kindness anonymous benefactors are showing their local law enforcement officers.

We’re not at Mad Max levels yet, but DC residents can’t get their hands on bottled water fast enough.
After a drop in pressure at the Bryant Street Pumping Station last night, DC Water is now recommending people throughout Northwest and Northeast boil their water to avoid potential contamination.
Or use bottled water.
Here is what local grocery store shelves looked like this morning: Safeway in Petworth A single jug of purified “nursery” water sits on one shelf.
The ice supply is depleted but not gone.
Trader Joe’s on 14th Street An updated map from DC Water shows the Trader Joe’s on 14th Street (and several other stores show below) is outside the contamination risk zone.
P Street Whole Foods Even in desperate times, no one wants Fiji.
Safeway near Dupont Circle They call it Soviet Safeway for a reason… CVS in Dupont Circle Again, no one wants Fiji?
Guys, there’s plenty of La Croix.
Photos by Ashley Mizuo and Jessica Sidman.

There’s annoyance, maybe some strained looks, but not panic as people walked out of grocery stores around D.C. Friday morning carrying cases of bottled water they didn’t anticipate buying.
“We have a baby and a two-year-old at home, so we drink a lot of water anyway,” Fulb said.
There’s annoyance, maybe some strained looks, but not panic as people walked out of grocery stores around D.C. Friday morning carrying cases of bottled water they didn’t anticipate buying.
“We have a baby and a two-year-old at home, so we drink a lot of water anyway,” Fulb said.
There’s annoyance, maybe some strained looks, but not panic as people walked out of grocery stores around D.C. Friday morning carrying cases of bottled water they didn’t anticipate buying.
“We have a baby and a two-year-old at home, so we drink a lot of water anyway,” Fulb said.
There’s annoyance, maybe some strained looks, but not panic as people walked out of grocery stores around D.C. Friday morning carrying cases of bottled water they didn’t anticipate buying.
“We have a baby and a two-year-old at home, so we drink a lot of water anyway,” Fulb said.
There’s annoyance, maybe some strained looks, but not panic as people walked out of grocery stores around D.C. Friday morning carrying cases of bottled water they didn’t anticipate buying.
“We have a baby and a two-year-old at home, so we drink a lot of water anyway,” Fulb said.

As the boil order is lifted, residents and business owners affected since Monday across Daviess County are starting to re-use water without boiling it.
When the boil water order was issued on Monday, people in Whitesville and other towns in Daviess County had to change their water consumption habits, such as drinking more bottled water.
"It’s a whole lot nicer because you don’t have to worry about boiling the water," says Scott Greer, who co-owns Kelly Rae’s Country Cafe in Whitesville.
"They didn’t like it, but they had to do it," said Joseph Wedding of Whitesville.
He resorted to using bottled water and boiling during the order.
He thinks everyone made it through this ordeal.
"I think everybody made it alright," he said.
Managers at Whitesville Senior Center moved to bottled water for drinks, and boiled water to clean dishes.
"Took it day by day," adds Greer.
For the latest breaking news and stories from across the Tri-State, follow Eyewitness News on Facebook and Twitter.

In an effort to stay hydrated this summer, many people keep a bottle of water close.
LOUISVILLE, Ky. (WDRB) — In an effort to stay hydrated this summer, many people keep a bottle of water close.
But in some cases, that can be a problem.
Dioni Amuchastegue, a battery technician on the west coast, recently made a mistake that is now educating people across the country, including right here in Kentuckiana.
"I looked over and noticed that light was being refracted through a water bottle and starting to catch the seat on fire."
Amuchastegue said the water bottle became a magnifying glass for the sunlight.
The spark generated by the sunlight and water bottle even surprised firefighters.
"I guess I never thought about it before, but it makes sense," Brooks said.
"So I would highly recommend that you keep any, especially clear plastic water bottles, out of direct sunlight."
Firefighters say if you don’t want to take the bottle with you, putting it under your seat is another option.

Here is more about how some strains of E. coli can make people sick.
However, some others can cause diseases, ranging from bladder infections to fatal multi-organ failure, according the Centers for Disease Control and Prevention.
E.coli are plentiful in the environment.
They can come from both human and animal intestines and are often found in stool.
Pets can also be infected and spread the bacteria.
E.coli contamination has been a common source of food- and water-related illness outbreaks, according to the CDC.
Some may feel ill three to four days after eating or drinking from a contaminated source, but it’s not uncommon for a person to feel ill on day one or even day ten.
Most people who become ill from E.coli will feel better in five to seven days, without any medications.
Some strains of E.coli may have become resistant to the antibiotics.
If there are any concerns, consider using bottled water for drinking and washing foods.

Others seeking dismissal include Flint’s former state-appointed emergency managers Ed Kurtz, Darnell Earley, and Gerald Ambrose; former Flint mayor Dayne Walling; former State Treasurer Andy Dillon, MDHHS director Nick Lyon; and several officials with the state Department of Environmental Quality.
Attorneys for Snyder argued he has qualified immunity from the lawsuit, and that he is not responsible for the actions of state-appointed emergency managers, who switched Flint to more corrosive river water in 2014, and kept the city on the water despite growing evidence it was unsafe.
Michael Pitt is one of the attorneys for Flint residents.
He says Snyder knew about the issues with the city’s water for ten months before officials finally admitted it.
"The evidence that he knew that there was a serious problem in Flint is overwhelming," says Pitt.
"He personally hurt a lot of people in Flint and he deserves to be held accountable for what he did."
She says others have it even worse.
"And for them not to want to compensate us," she says, "that’s heart-breaking, and messed up."
Plaintiff Ariana Hawk wants people to understand the crisis is not over.
She says she’s still waiting for lead test results to come back for the water in her house, and she’s still waiting for the lead service line to her house to be replaced.

St. Catharines is asking Coca-Cola to remove water from its vending machines at city facilities as council brings in an immediate ban on the sale of plastic water bottles.
It’s a first step in what council hopes will eventually be a ban on all plastic beverage bottles at city facilities to reduce waste and promote St. Catharines drinking water as a healthy alternative.
"I ask council to support what previous councils have been trying to do."
“To take a bottled water product away from a child and give them syrup, to me is just ridiculous.” Councillors voted 8-2 for the immediate ban in vending machines and concession stands, with St. George’s Coun.
"We’re not reducing the amount of plastic at all in our facilities, we’re actually just making people less healthy," Britton said.
"Although I support this for the environment, I just wonder which side we’re taking here," she said.
The agreement allows Coca-Cola to sell beverages in vending machines in city facilities and through the city’s third-party concession operators.
City staff reported that a ban on water bottles in vending machines and at concessions won’t result in material changes to the agreement, which includes a commission for the city from sales.
The St. Catharines Museum and Welland Canals Centre will be allowed to continue to sell bottled water so its 40,000 annual visitors can purchase water if they don’t have refillable bottles with them.
The city said Niagara Falls, London, Burlington and Toronto have removed water sold in plastic bottles from municipal facilities.

ROWAN COUNTY, N.C. – After years of drinking, cooking and even bathing with bottled water, residents near a coal ash site in Rowan County are finally using county water.
Rowan County purchases the water from the city of Salisbury and then sells it to neighbors.
“We have to pay the middle man now, which is county commissioners, and it is an outrageous amount,” resident Bonita Queen said.
County manager Aaron Church said the rate is essential to provide the service and he said the county isn’t turning a profit.
“There is no wiggle room,” Church said.
“We’re required by state law to pay for enterprise funds with enterprise fund money.
We cannot take money out of general fund and prop up the water fund.
"You can’t compare Rowan County’s water with Belmont because Rowan has a new system,” Church said.
Church said staff members met with neighbors in two public meetings last year to let them know what the rates would likely be.
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