PWS-level water intelligence

Atascocita Water Quality by MUD and PWS

Compare official Atascocita water-quality results across 12 district PWSs and the Houston-served MUD 450 pocket, with utility-boundary caveats.

✓ Official sources✓ System-specific✓ No invented city averages

Evidence status

Coverage model: Thirteen PWS contexts across districts and a City service pocket

Match the current water bill, HCAD district record, or official district map before applying any result to a property.

Measurements published

Atascocita is not one water system. Twelve district PWSs serve the established and newer communities, while City of Houston Main System serves the MUD 450 / Waters Edge pocket.

System resolution

Which water system applies?

Harris County MUD No. 46

TX1010903

2025 chlorine 1.14 ppm average; lead 0.5 ppb and copper 0.211 ppm at the 2021–2023 90th percentile. The report lists service-line-inventory and linked public-notice violations, not contaminant-limit exceedances.

Harris County MUD No. 106

TX1013160

Eagle Springs system. 2024 chlorine 2.12 ppm average, TTHM 4.1 ppb, and arsenic 2.3 ppb. Lead was 0.8 ppb and copper 0.488 ppm at the 2022 90th percentile; one sampled copper site was over the action level.

Harris County MUD No. 109

TX1010620

2025 chlorine 1.84 mg/L average; HAA5 and TTHM were 0 ppb highest LRAA. Lead was 2.1 ppb at the 2023–2025 90th percentile, with one sampled site over the action level; copper was 0.101 ppm.

Harris County MUD No. 132

TX1010616

2025 chlorine 1.93 ppm average. Lead was 0 ppb and copper 0.0582 ppm at the 2023 90th percentile. The two-page report did not publish HAA5 or TTHM result rows.

Harris County MUD No. 151

TX1010905

2025 chlorine 1.9 ppm average; lead 0 ppb and copper 0.16 ppm at the 90th percentile. Emergency-interconnect results from MUD 109 remain supplier-scoped.

Harris County MUD No. 152

TX1010902

Serves Atascocita South and Atasca Woods. 2025 chlorine 1.95 ppm average; lead 0.753 ppb and copper 0.14 ppm at the 2023 90th percentile.

Harris County MUD No. 153

TX1012133

2025 chlorine 1.40 ppm average; HAA5 and TTHM were 0 ppb highest LRAA. Lead was 4.26 ppb at the 2021–2023 90th percentile, with one sampled site over the action level; copper was 0.147 ppm.

Harris County MUD No. 278

TX1012835

Groundwater plus purchased Houston surface water. 2025 chloramine 2.89 ppm highest average, HAA5 19.3 ppb and TTHM 13 ppb highest detected. Lead was 1.2 ppb and copper 0.0714 ppm.

Harris County MUD No. 290

TX1013294

Purchases all reported groundwater from MUD 106. 2025 chlorine 2.21 ppm average, HAA5 0 ppb and TTHM 2 ppb highest LRAA. Lead was 0 ppb and copper 0.0872 ppm at the 2022–2024 90th percentile.

Harris County MUD No. 412

TX1013354

Lakeshore system receiving Houston surface water. 2024 chloramine 3.08 ppm highest average, HAA5 8 ppb and TTHM 11 ppb highest detected. Lead was 1.9 ppb and copper 0.0382 ppm at the 2022 90th percentile.

Harris County MUD No. 494

TX1013511

Receives all reported water from MUD 153. 2025 chlorine 1.42 ppm average; HAA5, TTHM, and lead were 0 at the published statistics; copper was 0.0195 ppm at the 90th percentile.

Harris County MUD No. 504

TX1013522

The Groves system receiving Houston water through MUD 412. 2024 chlorine 3.02 ppm average, HAA5 4.75 ppb and TTHM 5.08 ppb average. Lead was 1.3 ppb and copper 0.0173 ppm at the 2022 90th percentile.

City of Houston Main System - MUD 450 service pocket

TX1010013

City of Houston supplies Waters Edge and the MUD 450 service pocket; MUD 450 is not a separate drinking-water PWS. The 2025 Main System report lists hardness at 135.5 ppm average, TDS 260 ppm average, and pH 7.8 average.

Measured facts

Published measurements

District disinfectant residual1.14–3.08 ppm

PWS-specific 2024 or 2025 average/highest-average values; see the applicable system record.

Lead, 90th percentile0–4.26 ppb

Monitoring periods vary. MUDs 109 and 153 separately reported one sampled site over the action level.

HAA50–19.3 ppb

Highest LRAA, highest detected, or average depends on the PWS report; MUDs 132, 151, and 152 did not publish a row.

TTHM0–13 ppb

PWS-specific 2024 or 2025 statistic; this range is a navigation aid, not an Atascocita average.

LADS interpretation

What the evidence means—and does not mean

The summary ranges are navigation aids, not community averages. Every exact measurement remains attached to its PWS, statistic, and monitoring period.
Purchased water does not erase PWS identity: MUD 290 remains separate from MUD 106, MUD 494 from MUD 153, and MUD 504 from MUD 412 and Houston.
A sampled site over a lead or copper action level and the system 90th-percentile value are different facts. The affected reports preserve both.
MUD 450 is a governmental district, but its official FAQ says City of Houston supplies and operates water service. Publishing a fictional MUD 450 PWS would be incorrect.
Market-level publication is ready; household-level resolution is not. Confirm the utility before applying results or choosing treatment equipment.

Measured fact

Values above stay tied to their named system, units, sample or report year, and official source.

Publisher interpretation

Planning language is educational context. It is not an official safety determination, diagnosis, ranking, or equipment prescription.

Primary evidence

Official sources

Evidence before equipment

Use the report as context—not as a substitute for the property.

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