Public water system · TX1012763

Active

Haldor Topsoe

At a glance

Haldor Topsoe (PWSID TX1012763) is an active non-transient non-community water system in Harris County, Texas. It reports serving 150 people through 10 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 10 violations for this system; none is health-based, and the most recent began in October 2020.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

150

Service connections

Primary source

SWP

Purchased surface water

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDTX1012763

System typeNon-transient non-community water system

Activity statusActive

Population served150

Service connections10

Primary water sourcePurchased surface water

Owner typePrivate

Primacy agencyTX state drinking water program

City served—

StateTexas

ZIP—

CountyHarris County

How does Haldor Topsoe compare with other water systems in Harris County?

By EPA's size categories, Haldor Topsoe is a very small system (500 people or fewer). Harris County has 1,246 active public water systems. Its population served is well below the county average of 4,849 people per system, and accounts for less than 0.1% of the 6,041,784 people reported by systems filed under the county. Across Texas, the 7,078 active systems average 4,789 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Haldor Topsoe is about 65% below that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Texas has 862 active non-transient non-community water systems, 12% of the state's 7,078 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 1,192 Texas systems (17%) list purchased surface water as their primary source.

Who owns and regulates Haldor Topsoe?

EPA lists Haldor Topsoe as privately owned. The TX state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 732 of the 1,246 active systems in Harris County (59%) are also privately owned.

Does Haldor Topsoe have drinking water violations?

EPA's records list 10 violations for this system; none is health-based, and the most recent began in October 2020. The violations listed here began between June 1991 and October 2020. By type: 8 monitoring and reporting, 1 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 6 as resolved and 4 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2020-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2019-06-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2014-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2009-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2004-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1993-08-01	Public notice, recordkeeping or otherNotification, Public · code 06	Not reported	No	Archived
1993-08-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Archived
1991-09-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Archived
1991-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Archived

All 10 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Haldor Topsoe: frequently asked questions

Who runs Haldor Topsoe?

Haldor Topsoe (PWSID TX1012763) is a non-transient non-community water system privately owned. It is regulated by the TX state drinking water program.

How many people does Haldor Topsoe serve?

Haldor Topsoe reports serving 150 people through 10 service connections in Harris County, Texas.

Where does Haldor Topsoe get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does Haldor Topsoe have any drinking water violations?

EPA's records list 10 violations for this system; none is health-based, and the most recent began in October 2020. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Haldor Topsoe's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 10 violations for this system; none is health-based, and the most recent began in October 2020. For current results, consult EPA ECHO, or the TX state drinking water program.

Where can I find Haldor Topsoe's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Haldor Topsoe is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Harris County

Water system	County	Population served	Type	Source
City of Houston	Harris	2,970,543	Community	Surface water
City of Pasadena	Harris	152,000	Community	Purchased surface water
Clear Lake City Water Authority	Harris	89,702	Community	Purchased surface water
City of Baytown	Harris	86,004	Community	Purchased surface water
City of Houston Ud 5 - Kingwood	Harris	80,073	Community	Groundwater
Harris County MUD 165	Harris	40,503	Community	Purchased surface water

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Haldor Topsoe, PWSID TX1012763, Texas”, https://aquacensus.com/water-systems/texas/haldor-topsoe-tx1012763 (data as of October 1, 2026).