1. Where does our water come from?
Roughly 85 - 90% of our supply is surface water from
• the San Jacinto River through Lake Conroe and Lake Houston, and
• the Trinity River, through Lake Livingston.
The remaining 10 -15% percent is groundwater wells supplied by
• the Evangeline aquifer, and
• the Chicot aquifer.
2. What are the pH, hardness and dissolved solids of
Houston water?
Here are typical ranges for these parameters:
Total Hardness: 100-150 mg/L as CaCO3
pH: 7.2 - 8.5 standard units
Dissolved Solids: 100-250 mg/L
3. How is the water disinfected?
All of our water systems use chlorine to kill viruses and potentially
harmful bacteria that may be present. Most of our systems use free chlorine
(chlorine alone) to do the job; however our largest system - the Main System - uses
chloramines, which are made by combining chlorine and ammonia together. Chloramines
have a longer life-span than free chlorine and help keep adequate disinfection
throughout the full distance of our system water lines.
4. Does our water contain fluoride?
Yes. Low levels of fluoride are present in our raw water at levels up to 0.3 mg/L. Additionally
the City adds fluoride, as needed, to meet the recommendations of the Department of Health
and Human Services (HHS) and the Environmental Protection Agency (EPA). There is considerable scientific evidence
and support that fluoride is effective in preventing tooth decay throughout a person’s lifetime. We target fluoride levels
to remain under 0.7 mg/L which is the optimal level the HHS and EPA recommends for community water fluoridation.
Source: City Of Houston
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