Olympia Falls Water Plant

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: 594 people
Connections: 226
Water source: Groundwater
Based in: Magnolia, TX
County: Fort Bend
Owner: Private

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

Fluoride, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, chromium (total), nitrate and uranium: Texas’s own results, samples taken from Aug. 15, 2022 to Sept. 16, 2026.

Below EPA’s limits3

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.95ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 0.95 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

18.7ppb

Highest yearly average, 2022 to 2026

2026, one sample: 7.7 ppb

Averaged by year, the highest was 18.7 ppb, in 2023, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 7.7 ppb.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

2.7ppb

Highest yearly average, 2022 to 2026

2026: not found

Averaged by year, the highest was 2.7 ppb, in 2022, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

No certification claim covers this compound yet.

5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Chromium (total)
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. Fluoride, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, chromium (total), nitrate and uranium results here are Texas’s own from 2022 on, with EPA’s national file for 2012 to 2019. Olympia Falls Water Plant’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 Aug. 15, 2022 to Sept. 16, 2026.

Testing your own tap

Olympia Falls Water Plant’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.

No lab Texas certifies is within 75 miles of the area Olympia Falls Water Plant serves on the state’s list. Some take samples by mail; the state’s page lists them all.

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