Low concentrations of omicron variant found in Sacramento County sewage sample KCRA SacramentoSigns of Omicron found in California wastewater, suggesting variant is widespread Yahoo NewsHouston Health Department crews testing wastewater at dozens of schools KHOU 11Houston detected the omicron variant by testing wastewater -- but Dallas isn’t taking that approach The Dallas Morning NewsSigns of omicron variant found in California wastewater KTLA Los Angeles