National Drinking Water Database
City of Houston Public Works Utilities - Houston, TX
Serves 2,700,000 people
Manganese
Manganese is a naturally occurring element released from mineral deposits as well as industrial use.Testing Summary
| Contaminant | Average/ Maximum Result | Health Limit Exceeded | Legal Limit Exceeded | Testing History -Tested  -Detected  -Over Health Guidelines  -Over Legal Limit* |
|---|---|---|---|---|
| ManganeseManganese is a naturally occurring element released from mineral deposits as well as industrial use. | 6.11 ppb 13.18 ppb | No 50 ppb | No 50 ppb |  |
| NOTE: Each dot in the above graph represents one month. * Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance. | ||||
Health Based and Legal Limits for Manganese
Health Based Limits for Manganese
| Standard | Description | Level |
|---|---|---|
| EPA Human Health Water Quality Criteria | Water quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency. | 50 ppb |
| National Secondary Drinking Water Regulations | A National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. | 50 ppb |
| Lifetime health-based limit, non-cancer risk | Concentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency. | 300 ppb |
| Health-Based Screening Level | A benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey. | 300 ppb |
| Children's health-based limit for 1-day exposure | Concentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency. | 1000 ppb |
| Children's health-based limit for 10-day exposure | Concentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency. | 1000 ppb |
| Drinking Water Equivalent Level | A lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency. | 1600 ppb |
Testing Results
| Testing Date | Average Result | Samples taken that day | Number of Non-Detects | Range of Results |
|---|---|---|---|---|
| 2006-12-20 | 1.05 ppb | 2 | 1 | 0 to 2.1 ppb |
| 2006-12-07 | 13.05 ppb | 4 | 1 | 0 to 33.1 ppb |
| 2006-02-21 | 2.1 ppb | 2 | 0 | 2.1 ppb |
| 2005-12-19 | 5.15 ppb | 2 | 1 | 0 to 10.3 ppb |
| 2005-10-27 | 7.13 ppb | 3 | 0 | 4.5 to 8.7 ppb |
| 2005-07-27 | 2.58 ppb | 11 | 6 | 0 to 12.3 ppb |
| 2005-07-26 | 1.9 ppb | 4 | 1 | 0 to 2.8 ppb |
| 2005-07-20 | 3.2 ppb | 1 | 0 | 3.2 ppb |
| 2005-05-05 | 8.37 ppb | 6 | 1 | 0 to 15.5 ppb |
| 2005-05-04 | 5.46 ppb | 9 | 1 | 0 to 17.1 ppb |
| 2005-04-13 | 8.4 ppb | 2 | 0 | 4.2 to 12.6 ppb |
| 2005-01-26 | 12.06 ppb | 10 | 0 | 2.1 to 35.7 ppb |
| 2004-08-12 | 13.18 ppb | 3 | 1 | 0 to 30.3 ppb |
| 2004-07-08 | 5.6 ppb | 2 | 1 | 0 to 11.2 ppb |
| 2004-01-28 | 8.5 ppb | 2 | 0 | 3.9 to 13.1 ppb |
| 2004-01-27 | 4.6 ppb | 2 | 0 | 4.3 to 4.9 ppb |
| 2004-01-26 | 0 ppb | 1 | 1 | 0 ppb |
| 2004-01-14 | 3.65 ppb | 2 | 1 | 0 to 7.3 ppb |
| 2004-01-13 | 10.2 ppb | 2 | 1 | 0 to 20.4 ppb |