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| San Marcos Air Quality Travis County |
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| . | Good Days | Moderate Days | Unhealthy for Sensitive Persons Days | Unhealthy Days | Very Unhealthy Days |
| 2017 | 262 | 99 | 4 | 0 | 0 |
| 2016 | 280 | 85 | 1 | 0 | 0 |
| 2015 | 239 | 116 | 10 | 0 | 0 |
| 2014 | 262 | 103 | 0 | 0 | 0 |
| 2013 | 269 | 95 | 1 | 0 | 0 |
| San Marcos Water Quality San Marcos Watershed |
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| . | % Good | % Threatened | % Impaired |
| 2014 | na | na | na |
| 2012 | na | na | na |
| 2010 | 76 | 0 | 24 |
| 2008 | 88 | 0 | 12 |
| 2006 | 95 | 0 | 5 |
| 2004 | 87 | 0 | 13 |
| 2002 | 100 | 0 | 0 |
| San Marcos Recreation |
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| . | # of Parks | # of Parks (99 City Avg) |
| National Parks, Historic Sites, etc. (managed by National Park Service) |
Lyndon B. Johnson National Historical Park and San Antonio Missions National Historical Park | 7 |
| National Campgrounds, Lodges, etc. (other federal agency-managed sites) |
11 | 26 |
| State Parks, Sites, etc. | 10 | 11 |
| San Marcos Climate (1971-2000) |
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| . | . | 99 City Avg | January - Avg Low Temp | 39 F | 27 F |
| January - Avg Daily Temp | 50 F | 37 F |
| July - Avg Daily Temp | 84 F | 74 F |
| July - Avg High Temp | 95 F | 86 F |
| Avg Annual Precipitation | 37 in | 35 in |
| San Marcos Elevation | |
| 612 feet | GPTR 99 City Average 1,652 feet |
| San Marcos Natural Hazards |
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| . | Risk Level | 99 City Average |
| Total Hazard Risk | Moderate | Moderate |
| Earthquake | 0% | 10.9% |
| Tsunami | No Risk | No Risk |
| Hurricane | 20-40 | 10 |
| Flood | Very High | Very High |
| Tornado | Low | Low |
| Volcano | No Risk | No Risk |
| Wildfire | High | Low |
| San Marcos Man-Made Hazards (Nuclear) |
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| Nuclear Power Stations (# Reactors) |
Distance from City | GPTR 99 City Average |
| South Texas (2) | 130 miles | 50% of cities are within 100 miles of at least one nuclear station |
| San Marcos Heating and Cooling Degree Days (avg annual) |
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| . | . | 99 City Avg |
| Total Degree Days | 4,542 | 5,915 |
| HDD | 1,629 | 4,662 |
| CDD | 2,913 | 1,253 |
Legend: Small green circles (older style maps) or multi-colored circles (newer style maps: click here for legend) indicate 1)Superfund Sites 2)Federal Facilities 3)RCRA Corrective Action Sites and 4)Brownfields Properties (EPA hazardous material cleanup sites defined at Environment link)
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