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Montgomery County MUD 105

What EPA’s and Texas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
3,282 people
Connections
1,094
Water source
Groundwater
Based in
Houston, TX
County
Montgomery
Owner
Local government
The ZIP code it serves

77386

The short answer

Nothing in EPA’s and Texas’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), fluoride, arsenic, chromium (total), haloacetic acids (HAA5), nitrate and uranium: Texas’s own results, samples taken from June 8, 2020 to June 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

13ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 13 ppb, in 2026, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 8.0 ppb, in 2018.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.58ppm

Highest yearly average, 2022 to 2025

2025, one sample: 0.56 ppm

Averaged by year, the highest was 0.58 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.56 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.58 ppm, in 2016.

What handles it

6 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Lead
  • Nitrate
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), fluoride, arsenic, chromium (total), haloacetic acids (HAA5), nitrate and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Montgomery County MUD 105’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Texas’s results run from June 8, 2020 to June 1, 2026.

Testing your own tap

Montgomery County MUD 105’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Texas certifies.

The 3 labs Texas certifies closest to the area Montgomery County MUD 105 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Water Utility Services, Inc.

    Spring, TX · about 7 miles

    Certified for bacteria

    (281) 290-0704

  • Nova Biologicals, Inc.

    Conroe, TX · about 15 miles

    Certified for bacteria

    (936) 756-5333

  • Eurofins EMLab P&K – Houston

    Houston, TX · about 21 miles

    Certified for bacteria

    (281) 940-2580

Texas Well Owner Network, Texas A&M AgriLife Extension: Well Informed screening events, where well owners bring in water samples to be screened for common contaminants, followed by an hour-long session explaining the results. Upcoming events are on the network's calendar. Trainings, Texas Well Owner Network.

All 80 certified labs for Texas

Sources

PWSID TX1700837. Rebuilt from EPA data on Oct. 18, 2026.

Also in Montgomery County

All Texas utilities

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