New Mexico
Environment Department

Contact Information:
(505) 827-2855 MAIN // 1-800-219-6157 (toll free)
Environmental Emergencies:
505-827-9329 (24 hrs)

Pools Program

Recreational Water Illness (RWI)


For more information on prevention of Recreational Water Illness (RWI) outbreaks associated with swimming pools, water parks, hot tubs, lakes and rivers, click the following:


Cryptosporidium (or “crypto”) is a germ that causes diarrhea. It is spread when someone who has crypto uses your pool. Since crypto is chlorine resistant, even well maintained pools can spread crypto. To help prevent the spread of crypto, the Center for Disease Control (CDC) recommends the weekly hyperchlorination of all pools.

To view CDC’s Fecal Incident Response Recommendations click here


Legionella is a type of bacterium found naturally in freshwater environments, like lakes and streams. It can become a health concern when it grows and spreads in human-made water systems like

  • Showers and faucets
  • Cooling towers (air-conditioning units for large buildings)
  • Hot tubs that aren’t drained after each use
  • Decorative fountains and water features
  • Hot water tanks and heaters
  • Large plumbing systems

Click here to see the CDC Legionella forms and procedures: