A couple were left with a garden full of human waste after a drain exploded.
Sioned Charters' patio, drive and garage were flooded with water and raw sewage on Wednesday.
She said the foul stench caused by the incident was unbearable, and she was unable to open the windows in the house despite the baking heat.
She said Welsh Water promised an expert would arrive at the family's home in Gwersyllt that night as a priority.
But Ms Charters claims it took 10 phone calls and two days for action to be taken.
Photos show human waste, tissues, and brown water all over the garden after the drain became blocked.
Ms Charters said that she now fears her garden is unsafe due to the contamination, with her worries heightened by the coronavirus pandemic.
Ms Charters said: "We knew there was a problem at around 6pm on Wednesday and the drain was blocked. There was water trickling out of it and a pool in the garden, and when we lifted the manhole cover we could see it was blocked.
"We rang Welsh Water and were told that somebody would be coming that night. We waited and waited and by 11.45pm, we received a call saying that they were too busy and asked if we could wait until tomorrow and were told we would be the first call out of the day at 8am.
"8am came and nobody showed up and there were no phone calls. I contacted Welsh Water again who claimed they had rung twice and left voicemails, but I had no missed calls or messages.
"At 12.30pm on Thursday they said someone was coming, two hours passed and nobody had turned up still.
"By this point it was 27C degrees and the smell was really bad.
"I had my eight-month-old son at home who was crying, and he was hot, but we couldn't open the windows or doors due to the smell."
The mum said that Welsh Water then rang at 5.30pm saying that they were again too busy and said a crew would visit the following day (Friday, August 14).
"The smell was getting worse, there was more water coming out, and I said we could not wait because something bad will happen and we have a baby.
"I was cooking dinner at around 6pm and my other half came home and said had I seen the garden, I looked again and realised that human waste had exploded everywhere.
"There was human waste all over the garden, driveway and it had spread to our neighbour's garden. There was tissue and human waste everywhere." She said.
So frustrated by the lack of help, Ms Charters said she was forced to call her uncle for help who works for Welsh Water.
Soon after a crew turned up at her house to fix the problem, clear the blockage and disinfect the area.
However, upon inspection Ms Charters found that despite the team having sprayed a solution on the garden there was still evidence of human waste.
She said: "Without my uncle intervening I don't know how long we would have waited. It's been really stressful, I've been clock watching all day and been glued to my phone.
"I just burst into tears when I saw how bad it was, which I know is silly, but seeing my garden covered in human waste was awful.
"There is a lot going on with Covid, and we don't know who is infected so to have waste sitting on our patio is just not fair.
"We couldn't use the garden to play in, we couldn't even leave the house, or open the windows when the heat has been unbearable. It's been so frustating.
"We need someone to come and disinfect the area properly so that I know my son is safe.
"Someone has to be accountable for what happened and the response. Either the area needs to be fully cleaned and disinfected or the drain needs to be moved."
A spokesperson for Welsh Water said: “Following significant storms and rainfall in Wrexham area over the past few days we have had a number of calls from customers where rainwater has overwhelmed the system causing flooding and we have had to prioritise customers at risk of flooding to their homes.
“We have been in regular contact with the customer since her initial report, and have kept her informed regarding when our team were available to attend. However, we acknowledge there was a delay in coming to the property on 13 August, and we apologise to the customer for this inconvenience and for bearing with us while we dealt with the severe weather conditions.
“We went back to the property last night [13 August], and our investigation showed a significant blockage in the system caused by wet wipes and blue paper being flushed down the toilet. We cleared the blockage and carried out an initial clean-up, and have arranged to return today to complete the work. We will be carrying out a further CCTV survey of the sewer to see if there are any further blockages within the system.
“We would like to assure our customers that there is no evidence of risk from sewage of COVID-19 in our sewerage network, in line with World Health Organisation guidance.
“We would like to remind our customers not to dispose of any materials other than toilet roll down the toilet. Nappies, cotton buds and wet wipes can end up blocking our system. Similarly, pouring fat, oil and grease down sinks can cause blockages. The issue of blocked sewers and flooding costs the company £5 million a year. For more information on our ‘Stop the Block’ campaign, please visit dwrcymru.com.”
