Community Water System · PWS TX1700669
Mostyn Manor
Magnolia, Texas 77354-5148 - drinking water served from groundwater sources to 2,058 people, tracked in EPA SDWIS and UCMR5.
- 2,058
- People served
- 10
- EPA violations
- 0
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 10 drinking-water violations at Mostyn Manor - below the Texas per-system average.
- 10
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 2,058
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Mostyn Manor
Mostyn Manor is a private-owned community water system that delivers drinking water to 2,058 residents in Magnolia, Texas (Montgomery County) through 686 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 10 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 4 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.
The most frequently cited contaminant at this system is Chlorine, recorded in 4 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across Texas, EPA tracks 7,351 public water systems serving 33,253,313 people, with 746,210 cumulative violations and 162,945 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 101.5 violations. Statewide, 610 of 1,147 UCMR5-tested systems have reported PFAS detections (53.2%).
Mostyn Manor's 10 violations sit below the Texas average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 686
- County
- Montgomery
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 4
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 4 | 2019 |
| Public Notice | Other | 2 | 2020 |
| Consumer Confidence Rule | Other | 2 | 2019 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Mostyn Manor.
EPA SDWIS, Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID TX1700669 on SDWISSource: EPA SDWIS Federal Reports Search
Texas Drinking Water Authority
Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch is the primacy agency that licenses and inspects Mostyn Manor under EPA-delegated authority.
Open TX regulator portalSource: Texas Commission on Environmental Quality (TCEQ) - Drinking Water Watch
Violation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2020 | Public Notice | Other | 2 | SDWIS / TX1700669 / 7500 |
| 2019 | Chlorine | MR | 4 | SDWIS / TX1700669 / 0999 |
| 2019 | Consumer Confidence Rule | Other | 2 | SDWIS / TX1700669 / 7000 |
How Mostyn Manor Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Mostyn Manor | Texas avg | Federal benchmark |
|---|---|---|---|
| Total violations | 10 | 101.5 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 0 | 22.2 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 53.2% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 2,058 | 4,524 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,351 regulated public water systems in Texas.
Federal MCL reference, Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Mostyn Manor water safe to drink? ▼
How many people does Mostyn Manor serve? ▼
What type of violations does Mostyn Manor have? ▼
Has PFAS been detected in Mostyn Manor water? ▼
What water source does Mostyn Manor use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.