Two former guests at a downtown Los Angeles hotel where the decomposing body of a 21-year-old Canadian tourist was found in a water cistern have sued the hotel.

The lawsuit was filed Tuesday in Los Angeles Superior Court by Steven and Gloria Cott against the Cecil Hotel, one week after Elisa Lam was discovered at the bottom of a 4-foot-by-8-foot tank on the building's roof, The Associated Press reported.

The Cotts say that when they paid $150 for a two-night stay at the 15-story hotel they were promised running water safe for drinking and washing.

During their visit, Lam's body was found by a maintenance worker after hotel guests complained the building's water pressure was too low, police said.

The Vancouver, B.C., native had been last seen on Jan. 31 and is the subject of an LAPD homicide investigation, according to NBC Los Angeles. An autopsy was performed, but the official cause of death has not been disclosed.

Los Angeles health officials announced last week that water from the hotel's tanks does not contain harmful bacteria.

Ho / AFP - Getty Images

This undated image released by the Los Angeles Police Department shows Elisa Lam of Vancouver, Canada.

Samples taken from inside the water cistern and within the building all tested negative for fecal coliforms and total coliforms, according to Angelo Bellomo, director of environmental health for the Los Angeles County Department of Public Health.

"It's likely there was sufficient chlorine in the tank to destroy any bacteria that might have otherwise been present," Bellomo said.

A do-not-drink order is still in place in the building, according to NBC Los Angeles.

Representatives for the Cecil Hotel did not return calls for comment.

Related: No harmful bacteria in hotel water tank where dead tourist was found

Water from tanks in which the body of a Canadian tourist was found atop a downtown Los Angeles hotel does not contain harmful bacteria, health officials said Thursday.

Tests were done at the Cecil Hotel, where 21-year-old Elisa Lam was found dead in a water tank on the roof Tuesday.

The finding of the body disgusted long-term residents and guests of the budget single-room-occupancy hotel.

A do-not-drink order remains in place in the building, which had encountered water pressure problems before Lam's body was discovered, a county health official said.

Between 10 and 14 samples came back negative for fecal coliforms and total coliforms – levels that are examined when a dead animal, for example, is found in the water supply, according to Angelo Bellomo, director of environmental health for the Los Angeles County Department of Public Health.

Samples taken from inside the tank and within the building all tested negative, Bellomo said.

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"It's likely there was sufficient chlorine in the tank to destroy any bacteria that might have otherwise been present," Bellomo said.

The Los Angeles Department of Water and Power supplies water to the 15-story building, which holds supplies in four 4-foot-by-8-foot tanks on the roof. One of those tanks held Lam's body.

Bellomo said that recent cold weather may have limited bacteria production in the tank.

The hotel was required to provide alternate water sources and develop a plan for draining, flushing and sanitizing the pipes, Bellomo said. The plan has been approved by the Department of Public Health and is being fulfilled now, he said.

Another series of tests will be conducted before health officials will approve the hotel's water supply for drinking, he said.
For now, water in the hotel may only be used for flushing toilets, Bellomo said.

Lam, who was visiting LA from Vancouver, had last been seen Jan. 31 and is the subject of an LAPD homicide investigation.

She had stayed in the hotel and was caught on surveillance video acting strangely in the Cecil's elevator.

Her body was discovered after a maintenance worker went to inspect the water tanks upon low-pressure complaints. An autopsy was completed Thursday, but coroner's officials did not release details.

Related links:

• LA hotel where body was found in water tank has chilling history
• Body found in water tank of Los Angeles hotel is missing tourist
• Tourist found dead in LA hotel water tank

Robyn Beck / AFP - Getty Images

A worker stands on a water tank on the roof of the Cecil Hotel in Los Angeles, where visitor Elisa Lam was found dead, adding to its grim history.

The mysterious death of a Canadian tourist whose body was found in a Los Angeles water tank is the latest chapter in the bizarre history of a landmark hotel where two notorious serial killers have bedded down.

Once a faded single-room occupancy, the Cecil hotel was sold and renovated in 2007 and is now marketed as a "European-style" budget hotel with flat-screen TVs and a marble lobby.

But the unexplained death of 21-year-old Elisa Lam -- who vanished Jan. 31 and was found this week in a cistern that supplies drinking water to the hotel -- is focusing attention on other dark stories that have unfolded within the hotel's walls.

Heinz-Peter Bader / Reuters file

Jack Unterweger, seen here on the first day of his trial, stayed at the Cecil Hotel during a swing through Los Angeles, during which three prostitutes were killed.

Kim Cooper of Esotouric, a tour company, has included the Cecil on a bus tour called "Hotel Horrors" since 2007 but says its history doesn't strike her as particularly eerie considering its size and location.

"You have 700 rooms in constant business since 1927 at what was mainly a transient hotel," she said. "You have two unsavory people who stayed there, one murder in 1964 and a number of jumpers. But considering it's 80-plus years of history, I wouldn't say it's some sort of portal for weirdness."

Austrian serial killer Jack Unterweger stayed at the Cecil in 1991 after he was dispatched to L.A. by an Austrian magazine that wanted him to report on American crime, according to a 2007 book about him, "The Vienna Woods Killer."

At the time, Unterweger was a celebrated figure in his homeland. Convicted in 1976 of killing a hooker, choking her with her bra, he launched a writing career from his jail cell and was held up as a model of prisoner rehabilitation when he was released after 15 years.

During his three-week stay at the Cecil, three prostitutes were killed in Los Angeles; in each case, their bra was turned into a noose. Unterweger was questioned about the slayings and denied them, the book says.

He was never charged in the U.S. but back in Austria he was actually tried for the L.A. slayings — along with eight other local killings. He hanged himself in his prison cell after being found guilty on nine murder counts, according to the Los Angeles Times.

It's unknown why Unterweger chose the Cecil for his stay, but six years earlier it had been linked to another infamous murderer -- Richard Ramirez, dubbed the Night Stalker for a terrifying series of stabbings, shootings and beatings.

Ramirez, who is on California's death row after being convicted of 13 counts of murder, lived at the 700-room hotel for several weeks, the Los Angeles Times reported when he was arrested in 1985. Fellow residents recalled loud music and marijuana smoke coming from his 14th floor room.

LAPD via Reuters

Elisa Lam of Vancouver disappeared while staying at the Hotel Cecil, where her body was later found in the water tank.

Unterweger and Ramirez didn't commit any murders at the Cecil,  but it has been a crime scene.

In 1964, a kind-hearted woman, known as "Pigeon Goldie" because she fed the birds in nearby Pershing Square, was found raped, stabbed and strangled in her ransacked room.

Police suspected a serial killer could be the culprit because another middle-aged woman had been murdered the same way in a nearby hotel, but no one was ever charged.

Less unusual are a handful of suicides that have occurred through the years. A 30-year-old woman who took a bus from St. Louis to L.A., and had only 50 cents in her purse, leaped from an eighth-floor window in 1962, the L.A. Times reported.

Just nine months later, another young woman leaped or fell from the ninth-floor after an argument with her estranged husband -- and killed an elderly man walking on the street below, the newspaper said.

Cooper's next "Hotel Horrors" tour group will stop by the Cecil next week. She said they don't normally make a big deal out of recent crimes but will mention Lam's death, which has not yet been ruled foul play or accidental.

"It would seem almost disrespectful not to include it," she said.

We reached out to hotel management to find out what they know about the Cecil of years past but didn't hear back from them.