Water quality report for zip code

77305

City of Conroe

Groundwater

Source: Gulf Coast Aquifer - Jasper and Evangeline formations

Serves City of Conroe and parts of Montgomery County. Primarily groundwater with typical hardness.

Key Water Quality Findings

7 contaminants tested
Arsenic

health concern

Exceeds Health Guideline
4.8ppb(1200x health guideline)
EPA Legal Limit10 ppb
EWG Health Guideline0.004 ppb
California PHG0.004 ppb

A potent carcinogen that occurs naturally in groundwater. Even low levels increase cancer risk over a lifetime.

Data from 2023

Total Trihalomethanes (TTHMs)

health concern

Exceeds Health Guideline
14.6ppb(97x health guideline)

Range: 10 - 28 ppb

EPA Legal Limit80 ppb
EWG Health Guideline0.15 ppb

Cancer-causing chemicals that form when chlorine reacts with organic matter in water. Houston's levels are legal but far exceed health guidelines.

Data from 2023

Haloacetic Acids (HAA5)

health concern

Exceeds Health Guideline
3.75ppb(38x health guideline)
EPA Legal Limit60 ppb
EWG Health Guideline0.1 ppb

Another group of disinfection byproducts linked to cancer. Forms alongside TTHMs during water treatment.

Data from 2023

Radium (combined 226/228)

health concern

Exceeds Health Guideline
0.38pCi/L(8x health guideline)

Range: 2.1 - 4.5 pCi/L

EPA Legal Limit5 pCi/L
EWG Health Guideline0.05 pCi/L

Radioactive element found in groundwater. MUDs using well water often have elevated radium levels.

Data from 2023

Nitrate

health concern

Within Guidelines
0.131ppm
EPA Legal Limit10 ppm
EWG Health Guideline0.14 ppm

Especially dangerous for pregnant women and infants. Often comes from agricultural runoff.

Data from 2023

Additional Contaminants

Lead

health concern

Exceeds Health Guideline
1.15ppb(6x health guideline)
EPA Legal Limit15 ppb
EWG Health Guideline0.5 ppb
California PHG0.2 ppb

No safe level of lead exists. Comes from old pipes and fixtures, not the water source. Even "passing" samples can have dangerous spikes.

Data from 2023

Hardness

quality concern

Within Guidelines
19gpg0

Range: 15 - 24 gpg

Measured in grains per gallon (gpg). Houston water is "hard" to "very hard" at 8-20+ gpg, causing scale buildup and appliance damage.

Data from 2023

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