科斯塔梅萨县水区特此设立，其区域包括纽波特高地灌溉区、费尔维尤县水区、纽波特梅萨县水区、纽波特梅萨灌溉区，以及科斯塔梅萨市未包含在上述区域内的部分。此次合并后新设立的科斯塔梅萨县水区包含上述所有指定区域以及科斯塔梅萨市，科斯塔梅萨县水区的边界描述如下：
位于加利福尼亚州奥兰治县的所有特定不动产，描述如下：
Excepting therefrom all that certain real property situated in the County of Orange, State of California, owned by Hoag Memorial Hospital-Presbyterian, a corporation, described as:
A portion of Lot 172 Block 1, Lot 169 Block 2, and Lot 170 Block 2, of Irvine Subdivision, as per map recorded in Book 1, Page 88, Miscellaneous Maps, records of Orange County, California, and more particularly described as follows:
Beginning at the point of intersection of the northerly line of the West Ramp of the California State Highway described as second in the Deed recorded June 12th, 1931, in Book 489, Page 67 of Official Records, with the northwesterly line of the 60 foot right-of-way of the California State Highway, described in the Deed recorded June 30th, 1934, in Book 683, Page 248 of Official Records; thence northeasterly along the northwesterly line of said 60 foot right-of-way, a distance of 1371.39 feet; thence West 1019.26 feet to a point, said point being distant 518.21 feet South 60° 20´ 54″ East from the most westerly corner of Lot One Hundred Sixty-nine in Block Two of Irvine Subdivision, as shown on a map recorded in Book 1, Page 88 of Miscellaneous Maps, records of Orange County, California; thence South 10° 30´ 46″ East 190.75 feet; thence in a southeasterly direction along a curve concave to the northeast, having a radius of 1000 feet and through an angle of 12° 50´ 04″ a distance of 224 feet; thence South 23° 20´ 50″ East 253.42 feet; thence southeasterly along a curve concave to the northeast having a radius of 409.51 feet through an angle of 15° 41´ 02″ a distance of 112.10 feet; thence southeasterly along a reversed curve concave to the southwest having a radius of 514.46 feet through an angle of 12° 30´ 43″ a distance of 112.34 feet; thence South 26° 31´ 09″ East 584.24 feet to a point in a curve of the northwesterly line of said West Ramp of the California State Highway as described in said Deed recorded in Book 489, Page 67 of Official Records, said curve being concave to the South and having a radius of 450 feet, a line radial to curve at this point, bears North 12° 47´ 01″ West; thence easterly along said curve through an angle of 19° 51´ 06″ a distance of 155.91 feet to the point of beginning. The above 20 acre described parcel is shown on a Record of Survey, filed in Book 15, Page 30, Record of Surveys, Orange County, California.
Also, excepting therefrom that portion of Lot 5, Block “E”, and Lot 6, Block “E” of the Berry Tract as shown on a map thereof, recorded in Book 30, Page 74 of Miscellaneous Records of Los Angeles County, California, described as follows:
地块2。起点位于圣伊莎贝尔大道中心线上的一点，该点沿中心线向北偏西50度11分45秒方向，距离第300号地块第114号地块东南线的西南延长线30.00英尺处，该地图记录于加利福尼亚州奥兰治县杂项地图记录簿第14册第11页和第12页；然后，沿一条线向南偏西39度49分25秒方向，该线垂直测量并平行于第300号地块第105号地块东南线西北30.00英尺处，行进157.00英尺；然后，向北偏西50度11分45秒方向，行进300.00英尺；然后，向北偏东39度49分25秒方向，行进157.00英尺，到达所述圣伊莎贝尔大道的中心线；然后，向北偏西50度11分45秒方向，行进660.00英尺，到达所述第300号地块第113号地块东南330英尺的西北线的西南延长线；然后，沿所述西南延长线以及第300号地块第113号地块东南330英尺的西北线和所述第300号地块第116号地块东南330英尺的西北线，向北偏东39度48分45秒方向，行进1320.00英尺，到达蒙特维斯塔大道的中心线，该大道宽度为60.00英尺，如所述第300号地块地图所示；然后，沿所述蒙特维斯塔大道中心线向南偏东50度11分45秒方向，行进594.00英尺，到达所述第300号地块第115号地块西北330英尺的东南132英尺的西北半部的东南线的东北延长线；然后，沿最后提及的东北延长线和最后提及的东南线向南偏西39度48分45秒方向，行进330英尺，到达所述第300号地块第115号地块西北330英尺的东南66英尺的西南330英尺的东北线；然后，沿最后提及的东北线向南偏东50度11分45秒方向，行进66.00英尺，到达第115号地块西北330英尺的东南66英尺的所述西南330英尺的东南线；然后，沿最后提及的东南线和所述第300号地块第114号地块西北330英尺的东南线向南偏西39度48分45秒方向，行进462.00英尺，到达所述第300号地块第114号地块东南半部的东北264英尺的西南132英尺的西北线；然后，沿最后提及的东北线向南偏东50度11分45秒方向，行进300.00英尺，到达一条垂直测量并平行于所述第300号地块第114号地块东南线西北30英尺的线；然后，沿所述平行线向南偏西39度48分45秒方向，行进528.00英尺，到达起点。
